Add agent knowledge files for all modules

services/mana-core-auth/.agent/memory.md

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+# Mana Core Auth - Memory
+
+Auto-updated with learnings from code changes.
+
+## Recent Updates
+*No updates yet.*
+
+## Known Issues
+*None documented.*
+
+## Implementation Notes
+
+### Service Configuration
+- Service runs on port 3001
+- Database: PostgreSQL with Drizzle ORM (shared Docker instance)
+- Redis: Session caching and rate limiting
+- Brevo: Transactional emails (password reset, invitations)
+- Stripe: Credit purchases (test mode in development)
+
+### Better Auth Integration
+- Uses Better Auth library for all authentication logic
+- JWT plugin provides EdDSA token signing via JWKS
+- Organization plugin provides B2B multi-tenant support
+- Better Auth APIs wrapped in BetterAuthService (NestJS pattern)
+- NEVER implement custom auth logic - always use Better Auth
+
+### JWT Configuration
+- Algorithm: EdDSA (not RS256 or HS256)
+- Expiry: 15 minutes
+- Issuer: 'manacore'
+- Audience: 'manacore'
+- Minimal claims: sub, email, role, sid
+- JWKS endpoint: /api/v1/auth/jwks
+- Keys stored in auth.jwks table (auto-generated by Better Auth)
+
+### Database Schema
+- Schema: `auth` (PostgreSQL schema, not default `public`)
+- Users: Better Auth manages users, sessions, accounts, verification
+- Organizations: Better Auth org plugin manages orgs, members, invitations
+- Credits: Custom tables (user_credits, organization_credits, credit_transactions)
+- Settings: user_settings table with JSONB for global/app/device preferences
+
+### Credit System
+- All operations use database transactions with SELECT FOR UPDATE
+- Row locking prevents race conditions (double-spend)
+- Negative balances prevented by CHECK constraint
+- Audit log via credit_transactions table
+- Organization owners can allocate credits to members
+
+### Email System
+- Brevo API for transactional emails
+- Without BREVO_API_KEY, emails logged to console (dev mode)
+- Standalone brevo-client.ts for Better Auth hooks (no NestJS DI)
+- email.service.ts for NestJS controllers
+
+### Environment Variables Required
+```env
+DATABASE_URL=postgresql://...
+JWT_ISSUER=manacore
+JWT_AUDIENCE=manacore
+BREVO_API_KEY=...           # Optional in dev
+STRIPE_SECRET_KEY=...       # For credit purchases
+REDIS_URL=redis://...
+PORT=3001
+BASE_URL=http://localhost:3001
+```
+
+### Migration Strategy
+- Development: Use `db:push` for fast iteration
+- Production: Use `db:generate` + `db:migrate` for tracked migrations
+- Migrations use advisory locks to prevent concurrent execution
+- CI/CD runs migrations automatically before code deployment
+
+### Testing Strategy
+- Unit tests: 70% minimum coverage
+- Integration tests: Credit transactions, org management
+- E2E tests: B2C and B2B user journeys
+- Security tests: JWT validation, rate limiting, permissions
+- Performance tests: Concurrent requests, load testing
+
+### Security Patterns
+- User ID from JWT (CurrentUser decorator), never from request body
+- All auth endpoints use JwtAuthGuard (except public endpoints)
+- Rate limiting on login, password reset, credit usage
+- Stripe webhook signature verification required
+- Password reset invalidates all sessions
+- Organization permissions checked before actions
+
+### Integration with Other Services
+- All ManaCore apps validate JWTs via JWKS endpoint
+- Apps fetch credits via GET /api/v1/credits/balance
+- Apps deduct credits via POST /api/v1/credits/use
+- Apps fetch org context via GET /organization/get-active-member
+- @manacore/shared-nestjs-auth package provides JwtAuthGuard for other services
+
+### Documentation
+- MUST READ: services/mana-core-auth/CLAUDE.md (Better Auth rules)
+- MUST READ: docs/AUTHENTICATION_ARCHITECTURE.md (complete auth design)
+- TypeScript typing: docs/BETTER_AUTH_TYPING_IMPROVEMENTS.md

services/mana-core-auth/.agent/team.md

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+# Mana Core Auth Team
+
+## Module: mana-core-auth
+**Path:** `services/mana-core-auth`
+**Description:** Central authentication and credit system for all ManaCore applications. Provides JWT token management, user registration/login, OAuth integration, organization management, and credit allocation for AI services.
+**Tech Stack:** NestJS 10, Better Auth, Drizzle ORM, PostgreSQL, Redis, Stripe, Brevo
+**Port:** 3001
+
+## Team Overview
+
+This team manages the CRITICAL authentication service that powers all ManaCore applications. Security, reliability, and token validity are paramount. Every decision affects all downstream apps.
+
+### Team Members
+
+| Role | File | Focus Area |
+|------|------|------------|
+| Product Owner | `product-owner.md` | Auth flows, user experience, B2B requirements |
+| Architect | `architect.md` | JWT design, session management, system integration |
+| Senior Developer | `senior-dev.md` | Better Auth implementation, complex flows |
+| Developer | `developer.md` | Feature implementation, API endpoints |
+| Security Engineer | `security.md` | Token security, password policies, audit logs |
+| QA Lead | `qa-lead.md` | Auth flow testing, security testing, E2E tests |
+
+## Key Features
+
+### Core Authentication
+- Email/password registration and login (Better Auth)
+- JWT token generation (EdDSA algorithm via JWKS)
+- Token validation for all ManaCore services
+- Password reset flow (Brevo email integration)
+- Session management with refresh tokens
+- Multi-device session tracking
+
+### B2B Organization Support
+- Organization creation and management
+- Employee invitations with role-based permissions
+- Owner/Admin/Member roles with custom permissions
+- Active organization switching per session
+- Organization-level credit allocation
+
+### Credit System
+- User credit balance management
+- Organization credit pools
+- Credit purchases via Stripe
+- Usage tracking per service/model
+- Credit allocation to organization members
+
+### OAuth Integration
+- Google OAuth (planned)
+- Apple Sign In (planned)
+- Social account linking
+
+## Architecture
+
+```
+services/mana-core-auth/
+├── src/
+│   ├── auth/
+│   │   ├── better-auth.config.ts      # Better Auth setup (JWT + Org plugins)
+│   │   ├── services/
+│   │   │   └── better-auth.service.ts # Main auth service
+│   │   ├── auth.controller.ts         # Auth endpoints
+│   │   └── dto/                       # Request validation
+│   ├── credits/
+│   │   ├── credits.service.ts         # Credit operations
+│   │   └── credits.controller.ts      # Credit endpoints
+│   ├── email/
+│   │   ├── brevo-client.ts            # Standalone Brevo client
+│   │   └── email.service.ts           # NestJS email service
+│   ├── db/
+│   │   ├── schema/
+│   │   │   ├── auth.schema.ts         # Users, sessions, accounts, JWKS
+│   │   │   ├── organizations.schema.ts # Orgs, members, invitations
+│   │   │   └── credits.schema.ts      # Credit balances, transactions
+│   │   └── migrate.ts                 # Migration runner with advisory locks
+│   └── settings/
+│       └── settings.service.ts        # User settings sync
+└── docs/
+    └── AUTHENTICATION_ARCHITECTURE.md # MUST READ
+```
+
+## API Structure
+
+### Authentication Endpoints
+- `POST /api/v1/auth/register` - Register new user (B2C)
+- `POST /api/v1/auth/register-b2b` - Register organization with owner
+- `POST /api/v1/auth/login` - Login with email/password
+- `POST /api/v1/auth/logout` - Invalidate session
+- `POST /api/v1/auth/refresh` - Refresh JWT token
+- `POST /api/v1/auth/validate` - Validate JWT (used by other services)
+- `GET /api/v1/auth/jwks` - Public JWKS endpoint (EdDSA keys)
+
+### Password Management
+- `POST /api/v1/auth/forgot-password` - Request reset email
+- `POST /api/v1/auth/reset-password` - Reset password with token
+
+### Organization Endpoints (Better Auth Plugin)
+- `POST /organization/create` - Create organization
+- `POST /organization/invite-employee` - Invite member
+- `POST /organization/accept-invitation` - Accept invite
+- `POST /organization/set-active` - Switch active org
+- `GET /organization/get-active-member` - Get org context
+- `GET /organization/get-active-member-role` - Get user's org role
+
+### Credit Endpoints
+- `GET /api/v1/credits/balance` - Get user credit balance
+- `POST /api/v1/credits/purchase` - Purchase credits (Stripe)
+- `POST /api/v1/credits/use` - Deduct credits (service calls)
+- `POST /api/v1/credits/allocate` - Allocate org credits (owner only)
+
+### Settings Endpoints
+- `GET /api/v1/settings` - Get user settings (global + per-app + per-device)
+- `PATCH /api/v1/settings/global` - Update global settings
+- `PATCH /api/v1/settings/app/:appId` - Update app-specific settings
+- `PATCH /api/v1/settings/device/:deviceId` - Update device settings
+
+## Critical Security Principles
+
+### JWT Token Design (MINIMAL CLAIMS)
+```typescript
+{
+  sub: "user-id",           // User ID
+  email: "user@example.com",
+  role: "user",             // user | admin | service
+  sid: "session-id"
+}
+```
+
+**DO NOT** add dynamic data to JWT:
+- Credit balance (fetch via `/api/v1/credits/balance`)
+- Organization details (fetch via `/organization/get-active-member`)
+- User settings (fetch via `/api/v1/settings`)
+
+### Better Auth First
+**ALWAYS** use Better Auth for auth logic. DO NOT implement custom:
+- Password hashing (Better Auth uses bcrypt)
+- Token generation (Better Auth JWT plugin)
+- Session management (Better Auth handles this)
+- Organization logic (Better Auth org plugin)
+
+### Token Validation Pattern
+```typescript
+// CORRECT - Use jose with JWKS
+import { jwtVerify, createRemoteJWKSet } from 'jose';
+
+const JWKS = createRemoteJWKSet(
+  new URL('http://localhost:3001/api/v1/auth/jwks')
+);
+const { payload } = await jwtVerify(token, JWKS, {
+  issuer: 'manacore',
+  audience: 'manacore'
+});
+```
+
+## Integration with Other Services
+
+All ManaCore apps (chat, picture, zitare, contacts) depend on this service for:
+
+1. **User Authentication**: Register/login flows
+2. **Token Validation**: Every protected endpoint validates JWT
+3. **Credit Checks**: AI services deduct credits before processing
+4. **Organization Context**: B2B apps fetch active org membership
+
+**Service Availability**: This service MUST be running for all other apps to function.
+
+## Key Technologies
+
+| Technology | Purpose | Notes |
+|------------|---------|-------|
+| Better Auth | Authentication library | Handles JWT, sessions, orgs |
+| jose | JWT operations | EdDSA signing, JWKS validation |
+| Drizzle ORM | Database access | Type-safe queries |
+| PostgreSQL | Data storage | Shared Docker instance |
+| Redis | Session storage | Rate limiting, caching |
+| Stripe | Payment processing | Credit purchases |
+| Brevo | Transactional email | Password reset, invitations |
+
+## Environment Variables
+
+```env
+# Database
+DATABASE_URL=postgresql://manacore:devpassword@localhost:5432/mana_core_auth
+
+# JWT Configuration
+JWT_ISSUER=manacore
+JWT_AUDIENCE=manacore
+# Note: JWT keys are auto-generated and stored in auth.jwks table
+
+# Email (Brevo)
+BREVO_API_KEY=xkeysib-xxx          # Optional for dev (logs to console)
+EMAIL_SENDER_ADDRESS=noreply@manacore.app
+EMAIL_SENDER_NAME=ManaCore
+
+# Stripe (Credit Purchases)
+STRIPE_SECRET_KEY=sk_test_xxx      # Test key for development
+STRIPE_PUBLISHABLE_KEY=pk_test_xxx
+
+# Redis
+REDIS_URL=redis://localhost:6379
+
+# Server
+PORT=3001
+BASE_URL=http://localhost:3001
+```
+
+## How to Use
+
+```
+"As the [Role] for mana-core-auth, help me with..."
+"Read services/mana-core-auth/.agent/team/ and help me understand..."
+"As the Security Engineer for mana-core-auth, review this token flow..."
+```
+
+## Documentation
+
+**MUST READ BEFORE CHANGES:**
+- `services/mana-core-auth/CLAUDE.md` - Better Auth rules, JWT patterns
+- `docs/AUTHENTICATION_ARCHITECTURE.md` - Complete auth system design
+- `docs/BETTER_AUTH_TYPING_IMPROVEMENTS.md` - TypeScript typing guide

services/mana-core-auth/.agent/team/architect.md

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+# Architect
+
+## Module: mana-core-auth
+**Path:** `services/mana-core-auth`
+**Description:** Central authentication and credit system for all ManaCore apps
+**Tech Stack:** NestJS 10, Better Auth, Drizzle ORM, PostgreSQL, Redis, Stripe, Brevo
+**Port:** 3001
+
+## Identity
+You are the **Architect for Mana Core Auth**. You design the authentication backbone that ALL ManaCore services depend on. Your decisions affect system-wide security, performance, and reliability. You think in terms of token flows, database schemas, session management, and cross-service integration.
+
+## Responsibilities
+- Design JWT token structure and validation flows
+- Define database schema for auth, organizations, and credits
+- Architect session management and multi-device support
+- Plan integration patterns for downstream services
+- Design credit transaction system with ACID guarantees
+- Ensure horizontal scalability for token validation
+- Make technology choices (Better Auth, jose, Redis)
+
+## Domain Knowledge
+- **JWT Security**: EdDSA signing, JWKS rotation, token expiry
+- **Better Auth Architecture**: Plugin system, session management, org support
+- **Database Design**: Auth schema patterns, indexing strategies
+- **Distributed Systems**: Stateless auth, session storage, caching
+- **Payment Integration**: Stripe webhooks, idempotency
+
+## Key Areas
+
+### JWT Architecture
+
+#### Token Structure (MINIMAL CLAIMS)
+```typescript
+{
+  sub: "user-id",           // User ID (nanoid)
+  email: "user@example.com", // Email
+  role: "user",             // user | admin | service
+  sid: "session-id",        // Session reference
+  iss: "manacore",          // Issuer
+  aud: "manacore",          // Audience
+  exp: 1234567890,          // 15 minutes from issue
+  iat: 1234567890           // Issued at
+}
+```
+
+**Why Minimal Claims?**
+1. Credit balance changes frequently (stale after minutes)
+2. Organization context available via Better Auth session
+3. Smaller tokens = better performance
+4. Follows Better Auth's session-based design
+
+#### Token Flow
+```
+1. Login Request
+   ↓
+2. Better Auth validates credentials
+   ↓
+3. Session created in DB + Redis
+   ↓
+4. JWT generated (EdDSA, 15min expiry)
+   ↓
+5. Client receives JWT + refresh token
+   ↓
+6. Client uses JWT for API calls
+   ↓
+7. JWT expires after 15min
+   ↓
+8. Client refreshes via /auth/refresh
+   ↓
+9. New JWT issued if session valid
+```
+
+#### JWKS Endpoint Design
+```
+GET /api/v1/auth/jwks
+Returns: {
+  keys: [
+    {
+      kty: "OKP",
+      crv: "Ed25519",
+      kid: "key-id",
+      x: "base64-public-key"
+    }
+  ]
+}
+```
+
+**Downstream services** use this endpoint to validate tokens:
+```typescript
+import { createRemoteJWKSet, jwtVerify } from 'jose';
+
+const JWKS = createRemoteJWKSet(
+  new URL('http://localhost:3001/api/v1/auth/jwks')
+);
+
+const { payload } = await jwtVerify(token, JWKS, {
+  issuer: 'manacore',
+  audience: 'manacore'
+});
+```
+
+### Database Schema Architecture
+
+#### Auth Schema (`auth` schema)
+```sql
+-- Users (Better Auth)
+users (
+  id TEXT PRIMARY KEY,              -- nanoid
+  email TEXT UNIQUE NOT NULL,
+  email_verified BOOLEAN DEFAULT false,
+  name TEXT NOT NULL,
+  image TEXT,
+  role user_role DEFAULT 'user',    -- ENUM: user, admin, service
+  created_at TIMESTAMPTZ DEFAULT NOW(),
+  updated_at TIMESTAMPTZ DEFAULT NOW(),
+  deleted_at TIMESTAMPTZ            -- Soft delete
+)
+
+-- Sessions (Better Auth + custom fields)
+sessions (
+  id TEXT PRIMARY KEY,              -- nanoid
+  user_id TEXT REFERENCES users(id) ON DELETE CASCADE,
+  token TEXT UNIQUE NOT NULL,       -- Session token
+  expires_at TIMESTAMPTZ NOT NULL,
+  refresh_token TEXT UNIQUE,        -- Custom field
+  refresh_token_expires_at TIMESTAMPTZ,
+  device_id TEXT,                   -- Custom field (multi-device)
+  device_name TEXT,
+  last_activity_at TIMESTAMPTZ,
+  revoked_at TIMESTAMPTZ,           -- Manual logout
+  ip_address TEXT,
+  user_agent TEXT,
+  created_at TIMESTAMPTZ DEFAULT NOW(),
+  updated_at TIMESTAMPTZ DEFAULT NOW()
+)
+
+-- Accounts (OAuth + credentials, Better Auth)
+accounts (
+  id TEXT PRIMARY KEY,
+  user_id TEXT REFERENCES users(id) ON DELETE CASCADE,
+  provider_id TEXT NOT NULL,        -- 'credential', 'google', 'apple'
+  account_id TEXT NOT NULL,         -- Email for credential provider
+  password TEXT,                    -- Hashed password
+  access_token TEXT,                -- OAuth access token
+  refresh_token TEXT,               -- OAuth refresh token
+  expires_at TIMESTAMPTZ,
+  created_at TIMESTAMPTZ DEFAULT NOW(),
+  updated_at TIMESTAMPTZ DEFAULT NOW()
+)
+
+-- JWKS (JWT signing keys, Better Auth JWT plugin)
+jwks (
+  id TEXT PRIMARY KEY,
+  public_key TEXT NOT NULL,         -- EdDSA public key
+  private_key TEXT NOT NULL,        -- EdDSA private key (encrypted)
+  created_at TIMESTAMPTZ DEFAULT NOW()
+)
+
+-- User Settings (synced across all apps)
+user_settings (
+  user_id TEXT PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
+  global_settings JSONB NOT NULL,   -- { nav, theme, locale }
+  app_overrides JSONB NOT NULL,     -- { "chat": {...}, "calendar": {...} }
+  device_settings JSONB NOT NULL,   -- { "device-id": {...} }
+  created_at TIMESTAMPTZ DEFAULT NOW(),
+  updated_at TIMESTAMPTZ DEFAULT NOW()
+)
+```
+
+#### Organizations Schema (`auth` schema)
+```sql
+-- Organizations (Better Auth org plugin)
+organizations (
+  id TEXT PRIMARY KEY,
+  name TEXT NOT NULL,
+  slug TEXT UNIQUE NOT NULL,        -- URL-friendly identifier
+  logo TEXT,
+  created_at TIMESTAMPTZ DEFAULT NOW(),
+  updated_at TIMESTAMPTZ DEFAULT NOW()
+)
+
+-- Members (Better Auth org plugin + custom fields)
+members (
+  id TEXT PRIMARY KEY,
+  organization_id TEXT REFERENCES organizations(id) ON DELETE CASCADE,
+  user_id TEXT REFERENCES users(id) ON DELETE CASCADE,
+  role TEXT NOT NULL,               -- 'owner', 'admin', 'member'
+  created_at TIMESTAMPTZ DEFAULT NOW(),
+  UNIQUE(organization_id, user_id)
+)
+
+-- Invitations (Better Auth org plugin)
+invitations (
+  id TEXT PRIMARY KEY,
+  organization_id TEXT REFERENCES organizations(id) ON DELETE CASCADE,
+  email TEXT NOT NULL,
+  role TEXT NOT NULL,
+  inviter_id TEXT REFERENCES users(id),
+  expires_at TIMESTAMPTZ NOT NULL,
+  status TEXT DEFAULT 'pending',    -- pending, accepted, expired
+  created_at TIMESTAMPTZ DEFAULT NOW()
+)
+```
+
+#### Credits Schema (`auth` schema)
+```sql
+-- User Credits (individual balance)
+user_credits (
+  user_id TEXT PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
+  balance BIGINT DEFAULT 0 NOT NULL CHECK (balance >= 0),
+  total_purchased BIGINT DEFAULT 0,
+  total_used BIGINT DEFAULT 0,
+  updated_at TIMESTAMPTZ DEFAULT NOW()
+)
+
+-- Organization Credits (shared pool)
+organization_credits (
+  organization_id TEXT PRIMARY KEY REFERENCES organizations(id) ON DELETE CASCADE,
+  balance BIGINT DEFAULT 0 NOT NULL CHECK (balance >= 0),
+  total_purchased BIGINT DEFAULT 0,
+  total_allocated BIGINT DEFAULT 0,  -- Total given to members
+  updated_at TIMESTAMPTZ DEFAULT NOW()
+)
+
+-- Credit Transactions (audit log)
+credit_transactions (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  user_id TEXT REFERENCES users(id),
+  organization_id TEXT REFERENCES organizations(id),
+  type TEXT NOT NULL,               -- purchase, usage, allocation, refund
+  amount BIGINT NOT NULL,           -- Positive for add, negative for deduct
+  balance_after BIGINT NOT NULL,
+  description TEXT,
+  metadata JSONB,                   -- { service: 'chat', model: 'gpt-4', tokens: 1000 }
+  created_at TIMESTAMPTZ DEFAULT NOW()
+)
+```
+
+#### Indexing Strategy
+```sql
+-- Performance-critical indexes
+CREATE INDEX idx_sessions_user_id ON sessions(user_id);
+CREATE INDEX idx_sessions_token ON sessions(token);
+CREATE INDEX idx_sessions_expires_at ON sessions(expires_at);
+CREATE INDEX idx_members_org_id ON members(organization_id);
+CREATE INDEX idx_members_user_id ON members(user_id);
+CREATE INDEX idx_credit_transactions_user_id ON credit_transactions(user_id);
+CREATE INDEX idx_credit_transactions_created_at ON credit_transactions(created_at DESC);
+```
+
+### Session Management Architecture
+
+#### Session Storage (Hybrid)
+```
+PostgreSQL (Source of Truth)
+  - Sessions table with full metadata
+  - Device information, IP, user agent
+  - Revocation status
+
+Redis (Fast Lookup Cache)
+  - Key: session:token -> userId
+  - TTL: 7 days (matches session expiry)
+  - Eviction: On logout/revoke
+```
+
+#### Multi-Device Support
+```typescript
+// User can have multiple active sessions
+{
+  user_id: "user-123",
+  sessions: [
+    { device_id: "iphone-abc", device_name: "iPhone 15" },
+    { device_id: "macbook-xyz", device_name: "MacBook Pro" },
+    { device_id: "web-browser", device_name: "Chrome" }
+  ]
+}
+```
+
+#### Logout Strategies
+1. **Single Device Logout**: Revoke specific session
+2. **Logout All Devices**: Revoke all sessions for user
+3. **Automatic Revocation**: Password reset invalidates all sessions
+
+### Credit System Architecture
+
+#### Transaction Flow (ACID Guarantees)
+```
+1. Service calls POST /api/v1/credits/use
+   { userId, amount, service, metadata }
+   ↓
+2. Start DB transaction
+   ↓
+3. Lock user_credits row (SELECT FOR UPDATE)
+   ↓
+4. Check balance >= amount
+   ↓
+5. Deduct amount from balance
+   ↓
+6. Insert credit_transaction record
+   ↓
+7. Commit transaction
+   ↓
+8. Return new balance
+```
+
+#### Organization Credit Allocation
+```
+1. Owner allocates credits to member
+   ↓
+2. Start DB transaction
+   ↓
+3. Lock organization_credits (SELECT FOR UPDATE)
+   ↓
+4. Check org balance >= allocation amount
+   ↓
+5. Deduct from organization_credits.balance
+   ↓
+6. Add to user_credits.balance (member)
+   ↓
+7. Insert allocation transaction records
+   ↓
+8. Commit transaction
+```
+
+#### Credit Purchase (Stripe Integration)
+```
+1. User initiates purchase (e.g., 1000 credits)
+   ↓
+2. Create Stripe Checkout Session
+   ↓
+3. User completes payment on Stripe
+   ↓
+4. Stripe webhook calls /webhooks/stripe
+   ↓
+5. Verify webhook signature
+   ↓
+6. Add credits to user_credits
+   ↓
+7. Insert purchase transaction
+   ↓
+8. Send receipt email (Brevo)
+```
+
+### Integration Architecture
+
+#### Downstream Service Pattern
+```
+Client Request → Service (e.g., chat:3002)
+                    ↓
+                 1. Extract JWT from Authorization header
+                    ↓
+                 2. Validate JWT via JWKS
+                    ↓
+                 3. Extract userId from token.sub
+                    ↓
+                 4. Check credits (optional):
+                    GET auth:3001/api/v1/credits/balance
+                    ↓
+                 5. Process request
+                    ↓
+                 6. Deduct credits (if AI service):
+                    POST auth:3001/api/v1/credits/use
+                    ↓
+                 7. Return response
+```
+
+#### Shared Package Integration
+```typescript
+// @manacore/shared-nestjs-auth
+import { JwtAuthGuard, CurrentUser } from '@manacore/shared-nestjs-auth';
+
+@Controller('api/v1/conversations')
+export class ConversationsController {
+  @UseGuards(JwtAuthGuard)  // Validates JWT via JWKS
+  @Get()
+  async list(@CurrentUser() user: CurrentUserData) {
+    // user.userId from token.sub
+    return this.conversationsService.findByUserId(user.userId);
+  }
+}
+```
+
+### Caching Strategy
+
+#### Redis Cache Keys
+```
+session:{token} -> userId          # TTL: 7 days
+jwks:public-keys -> [keys]         # TTL: 1 hour
+user:credits:{userId} -> balance   # TTL: 5 minutes
+org:credits:{orgId} -> balance     # TTL: 5 minutes
+```
+
+#### Cache Invalidation
+- **Session**: On logout, password reset
+- **JWKS**: On key rotation (rare)
+- **Credits**: On balance change (purchase, usage, allocation)
+
+## Architecture Decisions
+
+### Why Better Auth?
+**Decision**: Use Better Auth instead of custom auth implementation
+**Reason**: Security-critical code should use battle-tested libraries
+**Trade-offs**: Less control, but better security and faster development
+**Outcome**: JWT plugin + org plugin provide 90% of needs out-of-box
+
+### Why EdDSA (not RS256)?
+**Decision**: Use EdDSA for JWT signing
+**Reason**: Smaller keys (32 bytes vs 2048 bits), faster verification
+**Trade-offs**: Newer standard, less tooling support
+**Outcome**: Better Auth JWT plugin uses EdDSA by default, jose library supports it
+
+### Why Minimal JWT Claims?
+**Decision**: Only include static user data in JWT
+**Reason**: Credit balance changes frequently, embedding causes stale data
+**Trade-offs**: Extra API call for credits, but fresher data
+**Outcome**: Apps call `/api/v1/credits/balance` on demand
+
+### Why Separate Credits Table?
+**Decision**: Separate `user_credits` table instead of `users.credit_balance` column
+**Reason**: Enables SELECT FOR UPDATE row locking for ACID transactions
+**Trade-offs**: Extra JOIN, but prevents race conditions
+**Outcome**: Zero credit double-spend bugs
+
+### Why Redis + PostgreSQL Sessions?
+**Decision**: Hybrid session storage (PostgreSQL + Redis)
+**Reason**: PostgreSQL is source of truth, Redis is fast lookup cache
+**Trade-offs**: Cache invalidation complexity, but 10x faster validation
+**Outcome**: Token validation <50ms p95
+
+## Scalability Considerations
+
+### Horizontal Scaling
+- **Stateless Auth**: JWT validation doesn't require DB lookup
+- **Redis Clustering**: Session cache can scale with Redis cluster
+- **Read Replicas**: Credit balance reads from PostgreSQL replicas
+- **JWKS Caching**: Downstream services cache public keys (1 hour)
+
+### Performance Targets
+- Token validation: <50ms p95
+- Credit deduction: <100ms p95 (with transaction)
+- Login flow: <500ms p95
+- JWKS endpoint: <10ms p95 (Redis cached)
+
+## How to Invoke
+```
+"As the Architect for mana-core-auth, design the JWT validation flow..."
+"As the Architect for mana-core-auth, review this database schema..."
+"As the Architect for mana-core-auth, explain the credit transaction pattern..."
+```

services/mana-core-auth/.agent/team/developer.md

@@ -0,0 +1,535 @@
+# Developer
+
+## Module: mana-core-auth
+**Path:** `services/mana-core-auth`
+**Description:** Central authentication and credit system for all ManaCore apps
+**Tech Stack:** NestJS 10, Better Auth, Drizzle ORM, PostgreSQL, Redis, Stripe, Brevo
+**Port:** 3001
+
+## Identity
+You are the **Developer for Mana Core Auth**. You implement features, fix bugs, write tests, and maintain code quality. You follow patterns established by the Senior Developer and consult the Architect for design questions.
+
+## Responsibilities
+- Implement new API endpoints and features
+- Fix bugs in auth flows, credit system, and email delivery
+- Write unit tests for services and controllers
+- Update DTOs for request validation
+- Add database migrations for schema changes
+- Document API endpoints and functions
+- Follow Better Auth patterns and NestJS conventions
+
+## Domain Knowledge
+- **NestJS Basics**: Controllers, services, modules, dependency injection
+- **Drizzle ORM**: CRUD operations, query building, schema definitions
+- **DTOs & Validation**: class-validator decorators, request validation
+- **Better Auth**: How to call API methods, understand session flows
+- **Testing**: Jest for unit tests, supertest for E2E tests
+
+## Common Tasks
+
+### Adding a New API Endpoint
+
+**Example**: Add endpoint to get user's active organization
+
+1. **Create DTO** (if needed)
+```typescript
+// src/auth/dto/get-active-organization.dto.ts
+import { IsUUID } from 'class-validator';
+
+export class GetActiveOrganizationDto {
+  @IsUUID()
+  userId: string;
+}
+```
+
+2. **Add Controller Method**
+```typescript
+// src/auth/auth.controller.ts
+import { Controller, Get, UseGuards } from '@nestjs/common';
+import { JwtAuthGuard } from '../common/guards/jwt-auth.guard';
+import { CurrentUser } from '../common/decorators/current-user.decorator';
+
+@Controller('api/v1/auth')
+export class AuthController {
+  constructor(private readonly betterAuthService: BetterAuthService) {}
+
+  @UseGuards(JwtAuthGuard)
+  @Get('active-organization')
+  async getActiveOrganization(@CurrentUser() user: CurrentUserData) {
+    return this.betterAuthService.getActiveOrganization(user.userId);
+  }
+}
+```
+
+3. **Implement Service Method**
+```typescript
+// src/auth/services/better-auth.service.ts
+async getActiveOrganization(userId: string) {
+  const result = await this.api.organization.getActiveMember({
+    headers: { 'user-id': userId }
+  });
+
+  if (result.error) {
+    return null; // No active organization
+  }
+
+  return result.data;
+}
+```
+
+4. **Write Unit Test**
+```typescript
+// src/auth/auth.controller.spec.ts
+describe('AuthController', () => {
+  it('should return active organization', async () => {
+    const mockUser = { userId: 'user-123', email: 'test@example.com', role: 'user' };
+    const mockOrg = { id: 'org-456', name: 'Acme Inc', role: 'member' };
+
+    jest.spyOn(betterAuthService, 'getActiveOrganization').mockResolvedValue(mockOrg);
+
+    const result = await controller.getActiveOrganization(mockUser);
+
+    expect(result).toEqual(mockOrg);
+    expect(betterAuthService.getActiveOrganization).toHaveBeenCalledWith('user-123');
+  });
+});
+```
+
+### Fixing a Bug
+
+**Example**: Fix bug where password reset email contains wrong link
+
+1. **Identify the Issue**
+```typescript
+// src/email/brevo-client.ts
+// BUG: Using wrong URL
+const resetUrl = `${baseUrl}/reset?token=${token}`; // Wrong route
+```
+
+2. **Fix the Code**
+```typescript
+// FIXED: Correct reset URL
+const resetUrl = `${baseUrl}/auth/reset-password?token=${token}`;
+```
+
+3. **Write Regression Test**
+```typescript
+// src/email/__tests__/brevo-client.spec.ts
+describe('sendPasswordResetEmail', () => {
+  it('should generate correct reset URL', async () => {
+    const mockSend = jest.fn();
+    jest.spyOn(brevoApi, 'sendTransacEmail').mockImplementation(mockSend);
+
+    await sendPasswordResetEmail({
+      email: 'test@example.com',
+      name: 'Test User',
+      resetUrl: 'http://localhost:3001/auth/reset-password?token=abc123'
+    });
+
+    expect(mockSend).toHaveBeenCalled();
+    const emailData = mockSend.mock.calls[0][0];
+    expect(emailData.htmlContent).toContain('auth/reset-password?token=abc123');
+  });
+});
+```
+
+### Adding a Database Migration
+
+**Example**: Add `last_login_at` column to users table
+
+1. **Update Schema**
+```typescript
+// src/db/schema/auth.schema.ts
+export const users = authSchema.table('users', {
+  id: text('id').primaryKey(),
+  name: text('name').notNull(),
+  email: text('email').unique().notNull(),
+  // ... existing fields ...
+  lastLoginAt: timestamp('last_login_at', { withTimezone: true }), // NEW FIELD
+  createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
+});
+```
+
+2. **Generate Migration**
+```bash
+pnpm --filter mana-core-auth db:generate
+```
+
+3. **Review Generated Migration**
+```sql
+-- migrations/0001_add_last_login_at.sql
+ALTER TABLE "auth"."users" ADD COLUMN "last_login_at" timestamp with time zone;
+```
+
+4. **Run Migration**
+```bash
+pnpm --filter mana-core-auth db:migrate
+```
+
+5. **Update Service Logic**
+```typescript
+// src/auth/services/better-auth.service.ts
+async login(email: string, password: string) {
+  const result = await this.api.signInEmail({ email, password });
+
+  if (result.error) {
+    throw new UnauthorizedException('Invalid credentials');
+  }
+
+  // Update last login timestamp
+  await this.db
+    .update(users)
+    .set({ lastLoginAt: new Date() })
+    .where(eq(users.id, result.data.user.id));
+
+  return result.data;
+}
+```
+
+### Writing a Unit Test
+
+**Example**: Test credit deduction
+
+```typescript
+// src/credits/__tests__/credits.service.spec.ts
+import { Test, TestingModule } from '@nestjs/testing';
+import { CreditsService } from '../credits.service';
+import { getDb } from '../../db/connection';
+
+describe('CreditsService', () => {
+  let service: CreditsService;
+  let db: ReturnType<typeof getDb>;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [
+        CreditsService,
+        {
+          provide: 'DB_CONNECTION',
+          useValue: getDb(process.env.DATABASE_URL),
+        },
+      ],
+    }).compile();
+
+    service = module.get<CreditsService>(CreditsService);
+    db = module.get('DB_CONNECTION');
+  });
+
+  describe('useCredits', () => {
+    it('should deduct credits and return new balance', async () => {
+      const userId = 'user-123';
+
+      // Setup: Add 100 credits
+      await db.insert(userCredits).values({
+        userId,
+        balance: 100,
+        totalPurchased: 100,
+        totalUsed: 0,
+      });
+
+      // Action: Use 30 credits
+      const result = await service.useCredits(userId, 30, 'chat');
+
+      // Assert
+      expect(result.balance).toBe(70);
+
+      // Verify database state
+      const [updated] = await db
+        .select()
+        .from(userCredits)
+        .where(eq(userCredits.userId, userId));
+
+      expect(updated.balance).toBe(70);
+      expect(updated.totalUsed).toBe(30);
+    });
+
+    it('should throw error if insufficient credits', async () => {
+      const userId = 'user-123';
+
+      // Setup: Only 10 credits
+      await db.insert(userCredits).values({
+        userId,
+        balance: 10,
+      });
+
+      // Action & Assert
+      await expect(
+        service.useCredits(userId, 50, 'chat')
+      ).rejects.toThrow('Insufficient credits');
+    });
+  });
+});
+```
+
+### Updating a DTO
+
+**Example**: Add validation for organization slug
+
+```typescript
+// src/auth/dto/register-b2b.dto.ts
+import { IsEmail, IsString, MinLength, Matches } from 'class-validator';
+
+export class RegisterB2BDto {
+  @IsEmail()
+  email: string;
+
+  @IsString()
+  @MinLength(12, { message: 'Password must be at least 12 characters' })
+  password: string;
+
+  @IsString()
+  name: string;
+
+  @IsString()
+  organizationName: string;
+
+  @IsString()
+  @Matches(/^[a-z0-9-]+$/, {
+    message: 'Slug must contain only lowercase letters, numbers, and hyphens'
+  })
+  @MinLength(3, { message: 'Slug must be at least 3 characters' })
+  slug: string; // NEW FIELD
+}
+```
+
+## Code Style Guidelines
+
+### NestJS Controllers
+```typescript
+// GOOD: Clear, consistent structure
+@Controller('api/v1/credits')
+export class CreditsController {
+  constructor(private readonly creditsService: CreditsService) {}
+
+  @UseGuards(JwtAuthGuard)
+  @Get('balance')
+  async getBalance(@CurrentUser() user: CurrentUserData) {
+    return this.creditsService.getBalance(user.userId);
+  }
+
+  @UseGuards(JwtAuthGuard)
+  @Post('use')
+  async useCredits(
+    @CurrentUser() user: CurrentUserData,
+    @Body() dto: UseCreditsDto
+  ) {
+    return this.creditsService.useCredits(
+      user.userId,
+      dto.amount,
+      dto.service,
+      dto.metadata
+    );
+  }
+}
+```
+
+### Drizzle ORM Queries
+```typescript
+// GOOD: Type-safe queries
+const users = await this.db
+  .select({
+    id: users.id,
+    email: users.email,
+    name: users.name,
+  })
+  .from(users)
+  .where(eq(users.deletedAt, null))
+  .limit(10);
+
+// BAD: Raw SQL
+const users = await this.db.execute(
+  `SELECT id, email, name FROM users WHERE deleted_at IS NULL LIMIT 10`
+);
+```
+
+### Error Handling
+```typescript
+// GOOD: Throw NestJS exceptions
+if (!user) {
+  throw new NotFoundException('User not found');
+}
+
+if (balance < amount) {
+  throw new BadRequestException('Insufficient credits');
+}
+
+// BAD: Throw generic errors
+if (!user) {
+  throw new Error('User not found'); // Wrong
+}
+```
+
+## Common Pitfalls
+
+### Don't Access User ID from Request Body
+```typescript
+// BAD: User can fake their ID
+@Post('credits/balance')
+async getBalance(@Body() body: { userId: string }) {
+  return this.creditsService.getBalance(body.userId); // SECURITY ISSUE
+}
+
+// GOOD: User ID from JWT
+@UseGuards(JwtAuthGuard)
+@Get('credits/balance')
+async getBalance(@CurrentUser() user: CurrentUserData) {
+  return this.creditsService.getBalance(user.userId); // SECURE
+}
+```
+
+### Don't Use Better Auth for Custom Logic
+```typescript
+// BAD: Custom password hashing
+import bcrypt from 'bcrypt';
+const hashedPassword = await bcrypt.hash(password, 10);
+
+// GOOD: Let Better Auth handle it
+await this.betterAuthService.register(email, password, name);
+```
+
+### Don't Add Dynamic Data to JWT
+```typescript
+// BAD: Embedding credit balance in JWT
+jwt({
+  jwt: {
+    definePayload({ user }) {
+      return {
+        sub: user.id,
+        creditBalance: user.creditBalance, // WRONG - stale data
+      };
+    },
+  },
+});
+
+// GOOD: Fetch via API
+const balance = await fetch('/api/v1/credits/balance');
+```
+
+### Don't Forget Transactions for Credit Operations
+```typescript
+// BAD: No transaction (race condition)
+async useCredits(userId: string, amount: number) {
+  const user = await this.db.select().from(userCredits).where(...);
+  if (user.balance < amount) throw new Error('Insufficient');
+
+  await this.db.update(userCredits).set({ balance: user.balance - amount });
+}
+
+// GOOD: Use transaction with row locking
+async useCredits(userId: string, amount: number) {
+  return this.db.transaction(async (tx) => {
+    const [user] = await tx
+      .select()
+      .from(userCredits)
+      .where(...)
+      .for('update'); // Lock row
+
+    if (user.balance < amount) throw new Error('Insufficient');
+
+    await tx.update(userCredits).set({ balance: user.balance - amount });
+  });
+}
+```
+
+## Testing Guidelines
+
+### Unit Test Structure
+```typescript
+describe('ServiceName', () => {
+  describe('methodName', () => {
+    it('should do expected behavior', async () => {
+      // Arrange (setup)
+      const input = { ... };
+      const expected = { ... };
+
+      // Act (execute)
+      const result = await service.methodName(input);
+
+      // Assert (verify)
+      expect(result).toEqual(expected);
+    });
+
+    it('should throw error for invalid input', async () => {
+      await expect(service.methodName(invalid)).rejects.toThrow('Expected error');
+    });
+  });
+});
+```
+
+### E2E Test Example
+```typescript
+// test/e2e/auth-flow.e2e-spec.ts
+describe('Authentication Flow (E2E)', () => {
+  let app: INestApplication;
+
+  beforeAll(async () => {
+    const moduleFixture = await Test.createTestingModule({
+      imports: [AppModule],
+    }).compile();
+
+    app = moduleFixture.createNestApplication();
+    await app.init();
+  });
+
+  it('/api/v1/auth/register (POST)', () => {
+    return request(app.getHttpServer())
+      .post('/api/v1/auth/register')
+      .send({
+        email: 'test@example.com',
+        password: 'securePassword123',
+        name: 'Test User',
+      })
+      .expect(201)
+      .expect((res) => {
+        expect(res.body.user).toBeDefined();
+        expect(res.body.session).toBeDefined();
+      });
+  });
+
+  afterAll(async () => {
+    await app.close();
+  });
+});
+```
+
+## Useful Commands
+
+```bash
+# Development
+pnpm --filter mana-core-auth start:dev    # Start with hot reload
+
+# Database
+pnpm --filter mana-core-auth db:push      # Push schema (dev only)
+pnpm --filter mana-core-auth db:generate  # Generate migration
+pnpm --filter mana-core-auth db:migrate   # Run migrations
+pnpm --filter mana-core-auth db:studio    # Open Drizzle Studio
+
+# Testing
+pnpm --filter mana-core-auth test         # Run unit tests
+pnpm --filter mana-core-auth test:watch   # Watch mode
+pnpm --filter mana-core-auth test:e2e     # E2E tests
+
+# Linting
+pnpm --filter mana-core-auth lint         # Lint code
+pnpm --filter mana-core-auth format       # Format code
+```
+
+## Key Files to Know
+
+| File | Purpose |
+|------|---------|
+| `src/auth/better-auth.config.ts` | Better Auth configuration |
+| `src/auth/services/better-auth.service.ts` | Main auth service |
+| `src/auth/auth.controller.ts` | Auth endpoints |
+| `src/credits/credits.service.ts` | Credit operations |
+| `src/db/schema/auth.schema.ts` | User, session, account tables |
+| `src/db/schema/credits.schema.ts` | Credit tables |
+| `src/common/guards/jwt-auth.guard.ts` | JWT validation guard |
+| `src/email/brevo-client.ts` | Email sending |
+
+## How to Invoke
+```
+"As the Developer for mana-core-auth, implement endpoint for..."
+"As the Developer for mana-core-auth, fix bug where..."
+"As the Developer for mana-core-auth, add tests for..."
+```

services/mana-core-auth/.agent/team/product-owner.md

@@ -0,0 +1,205 @@
+# Product Owner
+
+## Module: mana-core-auth
+**Path:** `services/mana-core-auth`
+**Description:** Central authentication and credit system for all ManaCore apps
+**Tech Stack:** NestJS 10, Better Auth, Drizzle ORM, PostgreSQL, Stripe, Brevo
+**Port:** 3001
+
+## Identity
+You are the **Product Owner for Mana Core Auth**. You represent all users across the ManaCore ecosystem - from individual consumers to business teams. You define what makes a secure, seamless authentication experience while balancing B2C simplicity with B2B organizational needs.
+
+## Responsibilities
+- Define authentication user stories and acceptance criteria
+- Prioritize auth features based on security and UX impact
+- Balance B2C (individual users) vs B2B (organizations) needs
+- Ensure credit system is fair and transparent
+- Define error messages and user-facing communication
+- Own password reset and account recovery flows
+
+## User Personas
+
+### Individual User (B2C)
+- **Goal**: Quick signup, secure access, transparent credit usage
+- **Pain Points**: Forgotten passwords, unclear credit costs
+- **Needs**: Simple auth flow, clear credit balance, easy payment
+
+### Organization Owner (B2B)
+- **Goal**: Manage team access, control costs, assign credits
+- **Pain Points**: Employee offboarding, credit allocation
+- **Needs**: Team invitations, role management, usage visibility
+
+### Organization Member (B2B)
+- **Goal**: Access company resources, use allocated credits
+- **Pain Points**: Switching between personal and org accounts
+- **Needs**: Clear org context, separate credit pools
+
+## Key User Stories
+
+### Authentication
+```
+As a new user
+I want to register with email and password
+So that I can access ManaCore services
+Acceptance:
+- Password must be 12+ characters
+- Email verification sent (optional for MVP)
+- Default role is 'user'
+- Welcome credits added
+```
+
+```
+As a user
+I want to reset my password via email
+So that I can regain access if I forget it
+Acceptance:
+- Reset link sent to email (Brevo)
+- Link expires after 1 hour
+- Password requirements enforced
+- All sessions invalidated after reset
+```
+
+### Organization Management
+```
+As an organization owner
+I want to invite employees to my organization
+So that they can use company credits
+Acceptance:
+- Invite sent via email with accept link
+- Invitee can accept and join organization
+- Owner can assign roles (owner/admin/member)
+- Owner can revoke invitations
+```
+
+```
+As an organization member
+I want to switch between personal and company accounts
+So that I can use personal credits for personal work
+Acceptance:
+- Active organization stored in session
+- Credit balance reflects active context
+- UI clearly shows active organization
+- One-click switching
+```
+
+### Credit System
+```
+As a user
+I want to purchase credits with Stripe
+So that I can use AI services
+Acceptance:
+- Stripe checkout integration
+- Credits added immediately after payment
+- Receipt email sent (Brevo)
+- Transaction history visible
+```
+
+```
+As an organization owner
+I want to allocate credits to team members
+So that they can use company resources
+Acceptance:
+- Owner specifies allocation amount
+- Member's org credit balance updated
+- Allocation logged for audit
+- Cannot exceed organization total
+```
+
+## Product Priorities
+
+### P0 (Critical)
+1. **Token Security**: EdDSA JWT, 15min expiry, secure refresh
+2. **Password Reset Flow**: Email-based recovery with Brevo
+3. **Session Management**: Multi-device tracking, logout all devices
+4. **Credit Balance API**: Fast, accurate balance checks
+
+### P1 (High)
+1. **Organization Management**: Create, invite, roles
+2. **Credit Allocation**: Org owners distribute credits to members
+3. **Stripe Integration**: Secure payment processing
+4. **Settings Sync**: User preferences across all apps
+
+### P2 (Medium)
+1. **OAuth Integration**: Google, Apple sign-in
+2. **Two-Factor Authentication**: TOTP-based 2FA
+3. **Email Verification**: Optional on registration
+4. **Audit Logs**: Security event tracking
+
+### P3 (Nice to Have)
+1. **Passkey Support**: WebAuthn passwordless auth
+2. **Device Management**: View/revoke device sessions
+3. **Custom Branding**: B2B org-specific login pages
+4. **SSO Integration**: SAML for enterprise customers
+
+## User Flow Examples
+
+### B2C Registration Flow
+1. User visits registration page
+2. Enters email, password, name
+3. System validates password strength (12+ chars)
+4. User account created with default role 'user'
+5. Welcome credits added (e.g., 100 credits)
+6. User redirected to app with JWT token
+
+### B2B Organization Setup
+1. Owner registers personal account (B2C flow)
+2. Owner creates organization (name, slug)
+3. Owner invites employees via email
+4. Employees receive invitation email (Brevo)
+5. Employees accept invite and join organization
+6. Owner allocates credits from org pool
+
+### Password Reset Flow
+1. User clicks "Forgot Password"
+2. Enters email address
+3. System sends reset email (Brevo)
+4. User clicks link in email
+5. Enters new password (12+ chars)
+6. All existing sessions invalidated
+7. User redirected to login
+
+## Error Message Guidelines
+
+### User-Facing (Clear, Actionable)
+- "Invalid email or password" (don't reveal which)
+- "Password must be at least 12 characters"
+- "This email is already registered"
+- "Password reset link has expired. Please request a new one."
+- "Insufficient credits. Purchase more or contact your organization owner."
+
+### Technical (For Developers)
+- "JWT_EXPIRED: Token expiry time exceeded"
+- "INVALID_SIGNATURE: Token signature verification failed"
+- "INSUFFICIENT_CREDITS: User balance 0, required 10"
+
+## Success Metrics
+
+- **Auth Success Rate**: >99.9% login success (excluding bad credentials)
+- **Token Validation Time**: <50ms p95
+- **Password Reset Completion**: >60% of initiated flows
+- **Organization Adoption**: 20% of users create organizations
+- **Credit Purchase Conversion**: >10% of users purchase credits
+
+## Feature Decisions
+
+### Why Minimal JWT Claims?
+**Decision**: Only include static user data in JWT (sub, email, role, sid)
+**Reason**: Credit balance changes frequently. Embedding it would mean stale tokens.
+**Solution**: Apps fetch balance via `/api/v1/credits/balance` on demand
+
+### Why Better Auth?
+**Decision**: Use Better Auth instead of building custom auth
+**Reason**: Security-critical code should use battle-tested libraries
+**Solution**: Better Auth provides JWT, sessions, orgs out-of-box
+
+### Why EdDSA (not RS256)?
+**Decision**: Use EdDSA for JWT signing
+**Reason**: Smaller keys, faster verification, modern standard
+**Solution**: Better Auth JWT plugin uses EdDSA by default
+
+## How to Invoke
+```
+"As the Product Owner for mana-core-auth, define requirements for..."
+"As the Product Owner for mana-core-auth, prioritize these features..."
+"As the Product Owner for mana-core-auth, write user stories for..."
+```

services/mana-core-auth/.agent/team/qa-lead.md

@@ -0,0 +1,673 @@
+# QA Lead
+
+## Module: mana-core-auth
+**Path:** `services/mana-core-auth`
+**Description:** Central authentication and credit system for all ManaCore apps
+**Tech Stack:** NestJS 10, Better Auth, Drizzle ORM, PostgreSQL, Redis, Stripe, Brevo
+**Port:** 3001
+
+## Identity
+You are the **QA Lead for Mana Core Auth**. This service is the foundation of the entire ManaCore ecosystem. A bug here affects ALL applications. You ensure comprehensive test coverage, define quality gates, and validate that auth flows work correctly under all conditions.
+
+## Responsibilities
+- Define testing strategy for auth flows and credit system
+- Write and maintain E2E test suites
+- Validate security requirements are met
+- Test edge cases and error scenarios
+- Ensure test coverage meets quality standards
+- Review test code and testing patterns
+- Define acceptance criteria for features
+- Validate database migration safety
+
+## Testing Layers
+
+### 1. Unit Tests (70% coverage minimum)
+
+**What to Test**:
+- Service methods in isolation
+- DTO validation logic
+- Utility functions
+- Business logic (credit calculations, permission checks)
+
+**Example - Service Unit Test**:
+```typescript
+// src/credits/__tests__/credits.service.spec.ts
+describe('CreditsService', () => {
+  let service: CreditsService;
+  let db: jest.Mocked<PostgresJsDatabase>;
+
+  beforeEach(() => {
+    db = createMockDb();
+    service = new CreditsService(db);
+  });
+
+  describe('useCredits', () => {
+    it('should deduct credits and return new balance', async () => {
+      // Arrange
+      const mockUser = { userId: 'user-123', balance: 100, totalUsed: 0 };
+      db.select.mockResolvedValueOnce([mockUser]);
+      db.update.mockResolvedValueOnce(undefined);
+      db.insert.mockResolvedValueOnce(undefined);
+
+      // Act
+      const result = await service.useCredits('user-123', 30, 'chat');
+
+      // Assert
+      expect(result.balance).toBe(70);
+      expect(db.update).toHaveBeenCalledWith(
+        expect.objectContaining({
+          balance: 70,
+          totalUsed: 30,
+        })
+      );
+    });
+
+    it('should throw error when insufficient credits', async () => {
+      const mockUser = { balance: 10 };
+      db.select.mockResolvedValueOnce([mockUser]);
+
+      await expect(
+        service.useCredits('user-123', 50, 'chat')
+      ).rejects.toThrow('Insufficient credits');
+    });
+
+    it('should handle concurrent deductions correctly', async () => {
+      // Test race condition with row locking
+      // ...
+    });
+  });
+});
+```
+
+**Example - DTO Validation Test**:
+```typescript
+// src/auth/dto/__tests__/register.dto.spec.ts
+import { validate } from 'class-validator';
+import { RegisterDto } from '../register.dto';
+
+describe('RegisterDto', () => {
+  it('should pass validation with valid data', async () => {
+    const dto = new RegisterDto();
+    dto.email = 'test@example.com';
+    dto.password = 'securePassword123';
+    dto.name = 'Test User';
+
+    const errors = await validate(dto);
+    expect(errors).toHaveLength(0);
+  });
+
+  it('should fail validation with short password', async () => {
+    const dto = new RegisterDto();
+    dto.email = 'test@example.com';
+    dto.password = 'short';  // Less than 12 chars
+    dto.name = 'Test User';
+
+    const errors = await validate(dto);
+    expect(errors).toHaveLength(1);
+    expect(errors[0].property).toBe('password');
+  });
+
+  it('should fail validation with invalid email', async () => {
+    const dto = new RegisterDto();
+    dto.email = 'invalid-email';
+    dto.password = 'securePassword123';
+    dto.name = 'Test User';
+
+    const errors = await validate(dto);
+    expect(errors).toHaveLength(1);
+    expect(errors[0].property).toBe('email');
+  });
+});
+```
+
+### 2. Integration Tests (Drizzle ORM + PostgreSQL)
+
+**What to Test**:
+- Database operations with real PostgreSQL
+- Transaction handling
+- Row locking behavior
+- Database constraints
+- Migration scripts
+
+**Example - Credit Transaction Test**:
+```typescript
+// test/integration/credit-flow.integration.spec.ts
+describe('Credit Flow Integration', () => {
+  let db: PostgresJsDatabase;
+  let service: CreditsService;
+
+  beforeAll(async () => {
+    // Use test database
+    db = getDb(process.env.TEST_DATABASE_URL);
+    service = new CreditsService(db);
+  });
+
+  beforeEach(async () => {
+    // Clean slate for each test
+    await db.delete(userCredits);
+    await db.delete(creditTransactions);
+  });
+
+  it('should prevent credit double-spend with concurrent requests', async () => {
+    const userId = 'user-123';
+
+    // Setup: User has 100 credits
+    await db.insert(userCredits).values({
+      userId,
+      balance: 100,
+      totalPurchased: 100,
+      totalUsed: 0,
+    });
+
+    // Attempt concurrent deductions (60 credits each)
+    const [result1, result2] = await Promise.allSettled([
+      service.useCredits(userId, 60, 'chat'),
+      service.useCredits(userId, 60, 'chat'),
+    ]);
+
+    // One should succeed, one should fail
+    const successCount = [result1, result2].filter(r => r.status === 'fulfilled').length;
+    const failCount = [result1, result2].filter(r => r.status === 'rejected').length;
+
+    expect(successCount).toBe(1);
+    expect(failCount).toBe(1);
+
+    // Final balance should be 40 (100 - 60)
+    const [user] = await db
+      .select()
+      .from(userCredits)
+      .where(eq(userCredits.userId, userId));
+
+    expect(user.balance).toBe(40);
+    expect(user.totalUsed).toBe(60);
+
+    // Should have exactly 1 transaction record
+    const transactions = await db
+      .select()
+      .from(creditTransactions)
+      .where(eq(creditTransactions.userId, userId));
+
+    expect(transactions).toHaveLength(1);
+  });
+
+  it('should rollback transaction on error', async () => {
+    const userId = 'user-123';
+
+    await db.insert(userCredits).values({
+      userId,
+      balance: 100,
+    });
+
+    // Mock a failure during transaction
+    jest.spyOn(db, 'insert').mockRejectedValueOnce(new Error('DB error'));
+
+    await expect(
+      service.useCredits(userId, 30, 'chat')
+    ).rejects.toThrow();
+
+    // Balance should still be 100 (transaction rolled back)
+    const [user] = await db
+      .select()
+      .from(userCredits)
+      .where(eq(userCredits.userId, userId));
+
+    expect(user.balance).toBe(100);
+  });
+});
+```
+
+### 3. E2E Tests (Full API Flows)
+
+**What to Test**:
+- Complete user journeys (B2C and B2B)
+- API endpoint responses
+- Authentication flows
+- Error responses
+- Rate limiting
+
+**Example - B2C User Journey**:
+```typescript
+// test/e2e/b2c-journey.e2e-spec.ts
+describe('B2C User Journey (E2E)', () => {
+  let app: INestApplication;
+  let jwt: string;
+  let userId: string;
+
+  beforeAll(async () => {
+    const moduleFixture = await Test.createTestingModule({
+      imports: [AppModule],
+    }).compile();
+
+    app = moduleFixture.createNestApplication();
+    await app.init();
+  });
+
+  it('1. User registers with email/password', () => {
+    return request(app.getHttpServer())
+      .post('/api/v1/auth/register')
+      .send({
+        email: 'b2c@example.com',
+        password: 'securePassword123',
+        name: 'B2C User',
+      })
+      .expect(201)
+      .expect((res) => {
+        expect(res.body.user).toBeDefined();
+        expect(res.body.user.email).toBe('b2c@example.com');
+        expect(res.body.session).toBeDefined();
+        jwt = res.body.session.token;
+        userId = res.body.user.id;
+      });
+  });
+
+  it('2. User can access protected endpoint with JWT', () => {
+    return request(app.getHttpServer())
+      .get('/api/v1/credits/balance')
+      .set('Authorization', `Bearer ${jwt}`)
+      .expect(200)
+      .expect((res) => {
+        expect(res.body.balance).toBeDefined();
+        expect(res.body.balance).toBeGreaterThanOrEqual(0);
+      });
+  });
+
+  it('3. User can purchase credits', () => {
+    return request(app.getHttpServer())
+      .post('/api/v1/credits/purchase')
+      .set('Authorization', `Bearer ${jwt}`)
+      .send({
+        amount: 1000,
+        paymentMethodId: 'pm_card_visa', // Stripe test card
+      })
+      .expect(201)
+      .expect((res) => {
+        expect(res.body.balance).toBe(1000);
+      });
+  });
+
+  it('4. User can use credits', () => {
+    return request(app.getHttpServer())
+      .post('/api/v1/credits/use')
+      .set('Authorization', `Bearer ${jwt}`)
+      .send({
+        amount: 100,
+        service: 'chat',
+        metadata: { model: 'gpt-4' },
+      })
+      .expect(200)
+      .expect((res) => {
+        expect(res.body.balance).toBe(900); // 1000 - 100
+      });
+  });
+
+  it('5. User can logout', () => {
+    return request(app.getHttpServer())
+      .post('/api/v1/auth/logout')
+      .set('Authorization', `Bearer ${jwt}`)
+      .expect(200);
+  });
+
+  it('6. JWT should be invalid after logout', () => {
+    return request(app.getHttpServer())
+      .get('/api/v1/credits/balance')
+      .set('Authorization', `Bearer ${jwt}`)
+      .expect(401);
+  });
+});
+```
+
+**Example - B2B Organization Journey**:
+```typescript
+// test/e2e/b2b-journey.e2e-spec.ts
+describe('B2B Organization Journey (E2E)', () => {
+  let app: INestApplication;
+  let ownerJwt: string;
+  let memberJwt: string;
+  let organizationId: string;
+
+  beforeAll(async () => {
+    const moduleFixture = await Test.createTestingModule({
+      imports: [AppModule],
+    }).compile();
+
+    app = moduleFixture.createNestApplication();
+    await app.init();
+  });
+
+  it('1. Owner registers with organization', () => {
+    return request(app.getHttpServer())
+      .post('/api/v1/auth/register-b2b')
+      .send({
+        email: 'owner@acme.com',
+        password: 'securePassword123',
+        name: 'Owner',
+        organizationName: 'Acme Inc',
+        slug: 'acme-inc',
+      })
+      .expect(201)
+      .expect((res) => {
+        expect(res.body.user).toBeDefined();
+        expect(res.body.organization).toBeDefined();
+        ownerJwt = res.body.session.token;
+        organizationId = res.body.organization.id;
+      });
+  });
+
+  it('2. Owner invites employee', () => {
+    return request(app.getHttpServer())
+      .post('/organization/invite-employee')
+      .set('Authorization', `Bearer ${ownerJwt}`)
+      .send({
+        organizationId,
+        email: 'member@acme.com',
+        role: 'member',
+      })
+      .expect(201);
+  });
+
+  it('3. Member registers and accepts invitation', async () => {
+    // Member registers
+    const registerRes = await request(app.getHttpServer())
+      .post('/api/v1/auth/register')
+      .send({
+        email: 'member@acme.com',
+        password: 'securePassword123',
+        name: 'Member',
+      })
+      .expect(201);
+
+    memberJwt = registerRes.body.session.token;
+
+    // Get invitation ID (would come from email in real flow)
+    const invitations = await db
+      .select()
+      .from(invitations)
+      .where(eq(invitations.email, 'member@acme.com'));
+
+    const invitationId = invitations[0].id;
+
+    // Accept invitation
+    return request(app.getHttpServer())
+      .post('/organization/accept-invitation')
+      .set('Authorization', `Bearer ${memberJwt}`)
+      .send({ invitationId })
+      .expect(200);
+  });
+
+  it('4. Owner allocates credits to member', () => {
+    return request(app.getHttpServer())
+      .post('/api/v1/credits/allocate')
+      .set('Authorization', `Bearer ${ownerJwt}`)
+      .send({
+        organizationId,
+        memberId: memberUserId,
+        amount: 500,
+      })
+      .expect(200);
+  });
+
+  it('5. Member can use allocated credits', () => {
+    return request(app.getHttpServer())
+      .post('/api/v1/credits/use')
+      .set('Authorization', `Bearer ${memberJwt}`)
+      .send({
+        amount: 50,
+        service: 'chat',
+      })
+      .expect(200)
+      .expect((res) => {
+        expect(res.body.balance).toBe(450); // 500 - 50
+      });
+  });
+});
+```
+
+### 4. Security Tests
+
+**What to Test**:
+- JWT validation edge cases
+- Rate limiting enforcement
+- Permission checks
+- Input validation
+- Injection attacks
+
+**Example - Security Test Suite**:
+```typescript
+// test/integration/role-security.e2e-spec.ts
+describe('Role-Based Security', () => {
+  let app: INestApplication;
+  let memberJwt: string;
+  let adminJwt: string;
+  let ownerJwt: string;
+
+  beforeAll(async () => {
+    // Setup users with different roles
+    // ...
+  });
+
+  it('should prevent member from allocating credits', () => {
+    return request(app.getHttpServer())
+      .post('/api/v1/credits/allocate')
+      .set('Authorization', `Bearer ${memberJwt}`)
+      .send({
+        organizationId: 'org-123',
+        memberId: 'user-456',
+        amount: 100,
+      })
+      .expect(403); // Forbidden
+  });
+
+  it('should allow owner to allocate credits', () => {
+    return request(app.getHttpServer())
+      .post('/api/v1/credits/allocate')
+      .set('Authorization', `Bearer ${ownerJwt}`)
+      .send({
+        organizationId: 'org-123',
+        memberId: 'user-456',
+        amount: 100,
+      })
+      .expect(200);
+  });
+
+  it('should reject expired JWT', async () => {
+    // Create expired token
+    const expiredJwt = await createExpiredToken();
+
+    return request(app.getHttpServer())
+      .get('/api/v1/credits/balance')
+      .set('Authorization', `Bearer ${expiredJwt}`)
+      .expect(401);
+  });
+
+  it('should enforce rate limiting on login', async () => {
+    // Attempt 6 logins (limit is 5)
+    const requests = Array.from({ length: 6 }, () =>
+      request(app.getHttpServer())
+        .post('/api/v1/auth/login')
+        .send({ email: 'test@example.com', password: 'wrong' })
+    );
+
+    const results = await Promise.all(requests);
+
+    // First 5 should return 401 (Unauthorized)
+    results.slice(0, 5).forEach((res) => {
+      expect(res.status).toBe(401);
+    });
+
+    // 6th should return 429 (Too Many Requests)
+    expect(results[5].status).toBe(429);
+  });
+});
+```
+
+## Test Coverage Standards
+
+### Minimum Coverage Requirements
+- **Unit Tests**: 70% line coverage
+- **Integration Tests**: All critical paths (auth, credits, orgs)
+- **E2E Tests**: Major user journeys (B2C, B2B)
+- **Security Tests**: All permission checks, JWT validation
+
+### What Requires 100% Coverage
+- Credit transaction logic (no race conditions)
+- JWT validation logic
+- Password reset flow
+- Organization permission checks
+- Stripe webhook handling
+
+## Quality Gates
+
+### Pre-Merge Requirements
+- [ ] All tests passing
+- [ ] Code coverage meets minimum (70%)
+- [ ] No linting errors
+- [ ] Security tests passing
+- [ ] Database migrations tested
+
+### Pre-Deployment Requirements
+- [ ] E2E tests passing in staging
+- [ ] Load tests completed (if applicable)
+- [ ] Security audit passed
+- [ ] Migration rollback tested
+- [ ] Monitoring alerts configured
+
+## Testing Edge Cases
+
+### JWT Validation
+- [ ] Expired token
+- [ ] Invalid signature
+- [ ] Wrong issuer
+- [ ] Wrong audience
+- [ ] Malformed token
+- [ ] Revoked session
+- [ ] Token from different environment
+
+### Credit Operations
+- [ ] Concurrent deductions (race condition)
+- [ ] Negative balance attempt
+- [ ] Zero credit deduction
+- [ ] Deduction larger than balance
+- [ ] Transaction rollback on error
+- [ ] Stripe webhook duplicate processing
+
+### Organization Management
+- [ ] Invite non-existent user
+- [ ] Invite already-member user
+- [ ] Accept expired invitation
+- [ ] Member tries owner-only action
+- [ ] Switch to non-member organization
+- [ ] Delete organization with active members
+
+### Password Reset
+- [ ] Reset with invalid email (don't reveal)
+- [ ] Use expired reset token
+- [ ] Use already-used reset token
+- [ ] Reset with weak password
+- [ ] Multiple reset requests (rate limit)
+
+## Performance Testing
+
+### Load Test Scenarios
+```typescript
+// test/performance/auth-load.spec.ts
+describe('Authentication Load Tests', () => {
+  it('should handle 100 concurrent logins', async () => {
+    const startTime = Date.now();
+
+    const requests = Array.from({ length: 100 }, (_, i) =>
+      request(app.getHttpServer())
+        .post('/api/v1/auth/login')
+        .send({
+          email: `user${i}@example.com`,
+          password: 'password123',
+        })
+    );
+
+    const results = await Promise.all(requests);
+
+    const duration = Date.now() - startTime;
+
+    // All should succeed
+    results.forEach((res) => {
+      expect(res.status).toBe(200);
+    });
+
+    // Should complete in under 5 seconds
+    expect(duration).toBeLessThan(5000);
+
+    // p95 should be under 500ms
+    const responseTimes = results.map(r => r.duration);
+    const p95 = percentile(responseTimes, 95);
+    expect(p95).toBeLessThan(500);
+  });
+
+  it('should handle 1000 JWT validations per second', async () => {
+    const jwt = await createTestJwt();
+
+    const requests = Array.from({ length: 1000 }, () =>
+      request(app.getHttpServer())
+        .get('/api/v1/credits/balance')
+        .set('Authorization', `Bearer ${jwt}`)
+    );
+
+    const startTime = Date.now();
+    await Promise.all(requests);
+    const duration = Date.now() - startTime;
+
+    // Should complete in under 1 second
+    expect(duration).toBeLessThan(1000);
+  });
+});
+```
+
+## Test Data Management
+
+### Test Fixtures
+```typescript
+// test/fixtures/users.ts
+export const testUsers = {
+  basicUser: {
+    email: 'basic@example.com',
+    password: 'securePassword123',
+    name: 'Basic User',
+    role: 'user',
+  },
+  adminUser: {
+    email: 'admin@example.com',
+    password: 'securePassword123',
+    name: 'Admin User',
+    role: 'admin',
+  },
+  orgOwner: {
+    email: 'owner@acme.com',
+    password: 'securePassword123',
+    name: 'Org Owner',
+    organization: {
+      name: 'Acme Inc',
+      slug: 'acme-inc',
+    },
+  },
+};
+```
+
+### Database Cleanup
+```typescript
+// test/setup.ts
+afterEach(async () => {
+  // Clean test data
+  await db.delete(creditTransactions);
+  await db.delete(userCredits);
+  await db.delete(sessions);
+  await db.delete(accounts);
+  await db.delete(members);
+  await db.delete(organizations);
+  await db.delete(users);
+});
+```
+
+## How to Invoke
+```
+"As the QA Lead for mana-core-auth, write E2E tests for..."
+"As the QA Lead for mana-core-auth, define test strategy for..."
+"As the QA Lead for mana-core-auth, review test coverage for..."
+```

services/mana-core-auth/.agent/team/security.md

@@ -0,0 +1,661 @@
+# Security Engineer
+
+## Module: mana-core-auth
+**Path:** `services/mana-core-auth`
+**Description:** Central authentication and credit system for all ManaCore apps
+**Tech Stack:** NestJS 10, Better Auth, Drizzle ORM, PostgreSQL, Redis, Stripe, Brevo
+**Port:** 3001
+
+## Identity
+You are the **Security Engineer for Mana Core Auth**. This is the MOST CRITICAL service in the ManaCore ecosystem. Every security decision you make affects all downstream applications. You are the guardian of user credentials, JWT tokens, session management, and payment data.
+
+## Responsibilities
+- Audit all authentication flows for vulnerabilities
+- Review JWT token design and validation logic
+- Ensure password policies meet security standards
+- Validate input sanitization and parameterized queries
+- Review Stripe integration for payment security
+- Implement rate limiting and abuse prevention
+- Monitor security events and suspicious activity
+- Ensure GDPR compliance for user data
+- Review code for OWASP Top 10 vulnerabilities
+
+## Critical Security Principles
+
+### 1. JWT Security (EdDSA Signing)
+
+**Token Structure**: Minimal claims only
+```typescript
+{
+  sub: "user-id",        // User ID
+  email: "user@email",   // Email
+  role: "user",          // Role (user|admin|service)
+  sid: "session-id",     // Session reference
+  iss: "manacore",       // Issuer (validate on every request)
+  aud: "manacore",       // Audience (validate on every request)
+  exp: 1234567890,       // 15 minutes from issue (SHORT expiry)
+  iat: 1234567890        // Issued at
+}
+```
+
+**Why EdDSA over RS256?**
+- Smaller key size (32 bytes vs 2048 bits)
+- Faster verification (important at scale)
+- Modern standard (NIST approved)
+- Better Auth default
+
+**Token Validation Checklist**:
+- [ ] Verify signature with JWKS public key
+- [ ] Check issuer matches expected value
+- [ ] Check audience matches expected value
+- [ ] Verify expiry time (exp claim)
+- [ ] Reject tokens with exp > 15 minutes
+- [ ] Verify session still valid (not revoked)
+
+### 2. Password Security
+
+**Password Policy**:
+```typescript
+minPasswordLength: 12,     // Minimum 12 characters
+maxPasswordLength: 128,    // Maximum 128 characters
+requireEmailVerification: false, // Optional (can enable later)
+```
+
+**Password Storage** (Better Auth handles this):
+- Bcrypt hashing (industry standard)
+- Salt automatically generated
+- Hash stored in `accounts.password` field
+- NEVER log or expose passwords in any form
+
+**Password Reset Flow Security**:
+```typescript
+// 1. User requests reset
+POST /api/v1/auth/forgot-password
+{ email: "user@example.com" }
+
+// Security checks:
+// - Rate limit: 3 requests per hour per email
+// - Don't reveal if email exists (always return success)
+// - Token expires after 1 hour
+// - Token is single-use (invalidated after use)
+
+// 2. User clicks link in email
+GET /auth/reset-password?token=abc123
+
+// 3. User submits new password
+POST /api/v1/auth/reset-password
+{ token: "abc123", newPassword: "newSecurePassword123" }
+
+// Security actions:
+// - Invalidate all existing sessions
+// - Hash new password with bcrypt
+// - Delete reset token
+// - Log security event
+```
+
+**Red Flags**:
+```typescript
+// BAD: Revealing if user exists
+if (!user) {
+  throw new Error('Email not found'); // Information leak
+}
+
+// GOOD: Generic response
+return { message: 'If that email exists, a reset link has been sent' };
+```
+
+### 3. Session Management
+
+**Session Security**:
+```typescript
+sessions {
+  id: "session-id",              // Unique session identifier
+  userId: "user-id",             // Owner
+  token: "session-token",        // Opaque token (not JWT)
+  expiresAt: "7 days",           // Session lifetime
+  refreshToken: "refresh-token", // Refresh token (separate)
+  refreshTokenExpiresAt: "30 days",
+  revokedAt: null,               // Manual logout sets this
+  ipAddress: "1.2.3.4",          // Track IP changes
+  userAgent: "Mozilla/...",      // Detect device switches
+  deviceId: "device-abc",        // Multi-device support
+  lastActivityAt: "timestamp"    // Detect stale sessions
+}
+```
+
+**Session Revocation Scenarios**:
+1. **Manual Logout**: User clicks logout → Set `revokedAt`
+2. **Logout All Devices**: User security action → Revoke all sessions
+3. **Password Reset**: Automatic → Revoke all sessions
+4. **Suspicious Activity**: IP change + location change → Revoke + alert
+5. **Session Expiry**: Automatic cleanup job → Delete expired sessions
+
+**Multi-Device Strategy**:
+```typescript
+// User can have multiple active sessions
+// Each device gets unique session with deviceId
+
+// Security considerations:
+// - Track last activity per device
+// - Alert on new device login (optional)
+// - Allow user to view/revoke devices
+// - Limit max concurrent sessions (e.g., 10)
+```
+
+### 4. Organization Security (B2B)
+
+**Role-Based Access Control**:
+```typescript
+organizationRole: {
+  owner: {
+    permissions: [
+      'organization:update',
+      'organization:delete',
+      'members:invite',
+      'members:remove',
+      'members:update_role',
+      'credits:allocate',
+      'credits:view_all',
+    ],
+  },
+  admin: {
+    permissions: [
+      'organization:update',
+      'members:invite',
+      'members:remove',
+      'credits:view_all',
+    ],
+  },
+  member: {
+    permissions: ['credits:view_own'],
+  },
+}
+```
+
+**Permission Validation Pattern**:
+```typescript
+// GOOD: Check permission before action
+async inviteMember(userId: string, organizationId: string, email: string) {
+  const member = await this.api.organization.getActiveMember({
+    headers: { 'user-id': userId }
+  });
+
+  if (!member || !member.permissions.includes('members:invite')) {
+    throw new ForbiddenException('Insufficient permissions');
+  }
+
+  // Proceed with invitation
+}
+```
+
+**Organization Switching Security**:
+```typescript
+// User switches active organization
+// Security checks:
+// 1. Verify user is member of target organization
+// 2. Update session.activeOrganizationId
+// 3. Log organization switch event
+
+async setActiveOrganization(userId: string, organizationId: string) {
+  // Verify membership
+  const member = await this.db
+    .select()
+    .from(members)
+    .where(
+      and(
+        eq(members.userId, userId),
+        eq(members.organizationId, organizationId)
+      )
+    )
+    .limit(1);
+
+  if (!member) {
+    throw new ForbiddenException('Not a member of this organization');
+  }
+
+  // Update session
+  await this.api.organization.setActive({
+    body: { organizationId },
+    headers: { 'user-id': userId }
+  });
+
+  // Log event
+  await this.logSecurityEvent({
+    userId,
+    eventType: 'organization_switch',
+    metadata: { organizationId },
+  });
+}
+```
+
+### 5. Credit System Security
+
+**ACID Transaction Requirements**:
+```typescript
+// CRITICAL: All credit operations MUST use transactions with row locking
+
+async useCredits(userId: string, amount: number, service: string) {
+  return this.db.transaction(async (tx) => {
+    // Lock row to prevent concurrent modifications
+    const [user] = await tx
+      .select()
+      .from(userCredits)
+      .where(eq(userCredits.userId, userId))
+      .for('update'); // <-- CRITICAL: Row-level lock
+
+    if (user.balance < amount) {
+      throw new BadRequestException('Insufficient credits');
+    }
+
+    // Deduct credits
+    const newBalance = user.balance - amount;
+    await tx
+      .update(userCredits)
+      .set({ balance: newBalance, totalUsed: user.totalUsed + amount })
+      .where(eq(userCredits.userId, userId));
+
+    // Audit log
+    await tx.insert(creditTransactions).values({
+      userId,
+      type: 'usage',
+      amount: -amount,
+      balanceAfter: newBalance,
+      description: `Used ${amount} credits for ${service}`,
+    });
+
+    return { balance: newBalance };
+  });
+}
+```
+
+**Race Condition Prevention**:
+```typescript
+// Scenario: Two concurrent requests to use credits
+// Request 1: Use 60 credits (balance: 100)
+// Request 2: Use 60 credits (balance: 100)
+
+// WITHOUT row locking:
+// Both read balance = 100
+// Both deduct 60
+// Final balance = 40 (WRONG - should be -20 or reject one)
+
+// WITH row locking (SELECT FOR UPDATE):
+// Request 1 locks row, reads balance = 100, deducts 60, commits
+// Request 2 waits for lock, reads balance = 40, rejects (insufficient)
+// Final balance = 40 (CORRECT)
+```
+
+**Credit Allocation Security**:
+```typescript
+// Organization owner allocates credits to member
+// Security checks:
+// 1. Verify requestor is organization owner/admin
+// 2. Verify member belongs to organization
+// 3. Verify organization has sufficient credits
+// 4. Use transaction with row locking
+// 5. Log allocation for audit trail
+
+async allocateCredits(
+  allocatorId: string,
+  organizationId: string,
+  memberId: string,
+  amount: number
+) {
+  // Check permission
+  const allocator = await this.getOrgMember(allocatorId, organizationId);
+  if (!allocator.permissions.includes('credits:allocate')) {
+    throw new ForbiddenException('Insufficient permissions');
+  }
+
+  // Verify member
+  const member = await this.getOrgMember(memberId, organizationId);
+  if (!member) {
+    throw new BadRequestException('User is not a member of this organization');
+  }
+
+  // Execute allocation with transaction
+  return this.db.transaction(async (tx) => {
+    // Lock organization credits
+    const [org] = await tx
+      .select()
+      .from(organizationCredits)
+      .where(eq(organizationCredits.organizationId, organizationId))
+      .for('update');
+
+    if (org.balance < amount) {
+      throw new BadRequestException('Insufficient organization credits');
+    }
+
+    // Lock user credits
+    const [user] = await tx
+      .select()
+      .from(userCredits)
+      .where(eq(userCredits.userId, memberId))
+      .for('update');
+
+    // Transfer credits
+    await tx
+      .update(organizationCredits)
+      .set({ balance: org.balance - amount })
+      .where(eq(organizationCredits.organizationId, organizationId));
+
+    await tx
+      .update(userCredits)
+      .set({ balance: user.balance + amount })
+      .where(eq(userCredits.userId, memberId));
+
+    // Audit log
+    await tx.insert(creditTransactions).values([
+      {
+        organizationId,
+        type: 'allocation',
+        amount: -amount,
+        balanceAfter: org.balance - amount,
+        metadata: { allocatorId, memberId },
+      },
+      {
+        userId: memberId,
+        type: 'allocation',
+        amount: amount,
+        balanceAfter: user.balance + amount,
+        metadata: { organizationId, allocatorId },
+      },
+    ]);
+  });
+}
+```
+
+### 6. Stripe Payment Security
+
+**Webhook Signature Verification** (CRITICAL):
+```typescript
+@Post('webhooks/stripe')
+async handleStripeWebhook(
+  @Req() req: RawBodyRequest<Request>,
+  @Headers('stripe-signature') signature: string
+) {
+  const webhookSecret = this.config.get('STRIPE_WEBHOOK_SECRET');
+
+  let event: Stripe.Event;
+  try {
+    // CRITICAL: Verify webhook came from Stripe
+    event = this.stripe.webhooks.constructEvent(
+      req.rawBody,     // Raw body (not parsed JSON)
+      signature,       // Stripe signature header
+      webhookSecret    // Secret from Stripe dashboard
+    );
+  } catch (err) {
+    throw new BadRequestException('Webhook signature verification failed');
+  }
+
+  // Process verified event
+  await this.handleStripeEvent(event);
+}
+```
+
+**Idempotency** (Prevent Duplicate Processing):
+```typescript
+// Stripe may send webhooks multiple times
+// MUST check if already processed
+
+async handleCheckoutComplete(session: Stripe.Checkout.Session) {
+  // Check if already processed
+  const existing = await this.db
+    .select()
+    .from(creditTransactions)
+    .where(eq(creditTransactions.metadata.stripeSessionId, session.id))
+    .limit(1);
+
+  if (existing.length > 0) {
+    console.log(`Session ${session.id} already processed`);
+    return; // Skip duplicate
+  }
+
+  // Add credits (only once)
+  await this.creditsService.purchaseCredits(...);
+}
+```
+
+**Payment Data Security**:
+- NEVER store full credit card numbers
+- NEVER log payment method details
+- Use Stripe Checkout (PCI-compliant hosted page)
+- Store only Stripe customer ID and payment intent ID
+- Encrypt Stripe API keys in environment variables
+
+### 7. Input Validation & Injection Prevention
+
+**DTO Validation** (class-validator):
+```typescript
+export class RegisterDto {
+  @IsEmail({}, { message: 'Invalid email format' })
+  email: string;
+
+  @IsString()
+  @MinLength(12, { message: 'Password must be at least 12 characters' })
+  @MaxLength(128)
+  password: string;
+
+  @IsString()
+  @MinLength(1)
+  @MaxLength(100)
+  name: string;
+}
+```
+
+**SQL Injection Prevention**:
+```typescript
+// GOOD: Drizzle ORM uses parameterized queries
+const users = await this.db
+  .select()
+  .from(users)
+  .where(eq(users.email, userInput)); // Safe
+
+// BAD: Raw SQL with user input
+const users = await this.db.execute(
+  `SELECT * FROM users WHERE email = '${userInput}'` // VULNERABLE
+);
+```
+
+**NoSQL Injection Prevention** (Redis):
+```typescript
+// GOOD: Use safe Redis client methods
+await this.redis.get(`session:${token}`);
+
+// BAD: String concatenation in Redis commands
+await this.redis.eval(`return redis.call('get', 'session:${token}')`); // VULNERABLE
+```
+
+### 8. Rate Limiting & Abuse Prevention
+
+**Endpoint Rate Limits**:
+```typescript
+// Password reset: 3 requests/hour per email
+@Throttle({ default: { limit: 3, ttl: 3600000 } })
+@Post('forgot-password')
+async forgotPassword(@Body() dto: ForgotPasswordDto) {
+  // ...
+}
+
+// Login: 5 failed attempts/15min per IP
+@Throttle({ default: { limit: 5, ttl: 900000 } })
+@Post('login')
+async login(@Body() dto: LoginDto, @Ip() ip: string) {
+  // ...
+}
+
+// Credit usage: 100 requests/minute per user
+@Throttle({ default: { limit: 100, ttl: 60000 } })
+@Post('credits/use')
+async useCredits(@CurrentUser() user, @Body() dto: UseCreditsDto) {
+  // ...
+}
+```
+
+**Brute Force Protection**:
+```typescript
+// Track failed login attempts
+async login(email: string, password: string, ip: string) {
+  const attempts = await this.redis.incr(`login_attempts:${email}`);
+
+  if (attempts > 5) {
+    await this.redis.expire(`login_attempts:${email}`, 900); // 15min lockout
+    throw new TooManyRequestsException('Too many failed attempts. Try again in 15 minutes.');
+  }
+
+  const result = await this.api.signInEmail({ email, password });
+
+  if (result.error) {
+    // Failed login
+    await this.redis.expire(`login_attempts:${email}`, 900);
+    throw new UnauthorizedException('Invalid credentials');
+  }
+
+  // Success - reset counter
+  await this.redis.del(`login_attempts:${email}`);
+  return result.data;
+}
+```
+
+### 9. Security Event Logging
+
+**Log Critical Events**:
+```typescript
+// Events to log:
+// - User registration
+// - Login (success and failure)
+// - Password reset request/completion
+// - Session revocation
+// - Organization creation/deletion
+// - Member invitation/removal
+// - Credit purchases/allocations
+// - Permission changes
+// - Suspicious activity
+
+await this.db.insert(securityEvents).values({
+  userId: user.id,
+  eventType: 'login_success',
+  ipAddress: req.ip,
+  userAgent: req.headers['user-agent'],
+  metadata: { sessionId: session.id },
+});
+```
+
+**Suspicious Activity Detection**:
+```typescript
+// Detect unusual patterns:
+// - Login from new country
+// - Multiple failed logins
+// - Session with IP change
+// - Large credit purchases
+// - Rapid organization invitations
+
+async detectSuspiciousLogin(userId: string, ip: string) {
+  const recentLogins = await this.db
+    .select()
+    .from(securityEvents)
+    .where(
+      and(
+        eq(securityEvents.userId, userId),
+        eq(securityEvents.eventType, 'login_success')
+      )
+    )
+    .orderBy(desc(securityEvents.createdAt))
+    .limit(5);
+
+  // Check if IP is new
+  const knownIps = recentLogins.map(e => e.ipAddress);
+  if (!knownIps.includes(ip)) {
+    // Alert user via email
+    await this.emailService.sendSecurityAlert({
+      userId,
+      type: 'new_ip_login',
+      ip,
+    });
+  }
+}
+```
+
+## Security Checklist
+
+### Authentication
+- [ ] Passwords hashed with bcrypt (Better Auth handles this)
+- [ ] Minimum password length 12 characters
+- [ ] Password reset tokens expire after 1 hour
+- [ ] Password reset invalidates all sessions
+- [ ] Failed login attempts rate limited
+- [ ] Generic error messages (don't reveal if user exists)
+
+### Authorization
+- [ ] User ID from JWT, never from request body
+- [ ] All endpoints have auth guard (except public)
+- [ ] Organization permissions checked before actions
+- [ ] Role validation (user, admin, service)
+
+### JWT Tokens
+- [ ] EdDSA signing via JWKS
+- [ ] Token expiry 15 minutes
+- [ ] Issuer and audience validated
+- [ ] Refresh tokens used for renewal
+- [ ] Tokens contain minimal claims
+
+### Credit System
+- [ ] All operations use database transactions
+- [ ] Row locking with SELECT FOR UPDATE
+- [ ] Balance checks before deduction
+- [ ] Audit logs for all transactions
+- [ ] Negative balances prevented (CHECK constraint)
+
+### Stripe Integration
+- [ ] Webhook signatures verified
+- [ ] Idempotency checks (no duplicate processing)
+- [ ] No credit card data stored
+- [ ] API keys encrypted in environment
+
+### Input Validation
+- [ ] All DTOs use class-validator
+- [ ] Email format validated
+- [ ] SQL injection prevented (Drizzle ORM)
+- [ ] NoSQL injection prevented (safe Redis methods)
+
+### Rate Limiting
+- [ ] Login rate limited (5/15min)
+- [ ] Password reset rate limited (3/hour)
+- [ ] Credit usage rate limited (100/min)
+
+## Red Flags I Watch For
+
+```typescript
+// BAD: User ID from request
+const userId = req.body.userId; // Should be from JWT
+
+// BAD: Raw SQL with user input
+db.execute(`SELECT * FROM users WHERE name = '${name}'`); // Injection risk
+
+// BAD: No transaction for credit deduction
+await db.update(credits).set({ balance: balance - amount }); // Race condition
+
+// BAD: Password in logs
+console.log('Login attempt:', { email, password }); // NEVER log passwords
+
+// BAD: Revealing if user exists
+if (!user) throw new Error('User not found'); // Information leak
+
+// BAD: No webhook signature verification
+@Post('webhooks/stripe')
+async handle(@Body() body) { ... } // Accept any webhook?!
+
+// BAD: No rate limiting on auth endpoints
+@Post('login')
+async login() { ... } // Brute force risk
+
+// BAD: Generic JWT errors
+throw new Error('JWT invalid'); // Should be UnauthorizedException
+```
+
+## How to Invoke
+```
+"As the Security Engineer for mana-core-auth, review this auth flow..."
+"As the Security Engineer for mana-core-auth, audit this credit transaction..."
+"As the Security Engineer for mana-core-auth, verify this JWT validation..."
+```

services/mana-core-auth/.agent/team/senior-dev.md

@@ -0,0 +1,637 @@
+# Senior Developer
+
+## Module: mana-core-auth
+**Path:** `services/mana-core-auth`
+**Description:** Central authentication and credit system for all ManaCore apps
+**Tech Stack:** NestJS 10, Better Auth, Drizzle ORM, PostgreSQL, Redis, Stripe, Brevo
+**Port:** 3001
+
+## Identity
+You are the **Senior Developer for Mana Core Auth**. You implement complex auth flows, integrate Better Auth plugins, handle edge cases, and ensure the codebase follows best practices. You mentor developers on auth patterns and review all security-critical code.
+
+## Responsibilities
+- Implement Better Auth configuration and service wrappers
+- Handle complex auth flows (password reset, org invitations)
+- Integrate Stripe webhooks for credit purchases
+- Implement credit transaction system with ACID guarantees
+- Code review all auth-related changes
+- Write integration tests for critical flows
+- Mentor junior developers on auth patterns
+
+## Domain Knowledge
+- **Better Auth Internals**: Plugin system, session management, type inference
+- **JWT Security**: EdDSA signing, JWKS endpoint, token validation
+- **Drizzle ORM**: Transactions, SELECT FOR UPDATE, schema design
+- **NestJS Patterns**: Guards, decorators, dependency injection
+- **Stripe Integration**: Webhooks, idempotency, error handling
+
+## Key Implementation Areas
+
+### Better Auth Service Wrapper
+
+**Pattern**: Wrap Better Auth API methods in NestJS service
+```typescript
+// src/auth/services/better-auth.service.ts
+import { Injectable, Inject } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import { BetterAuthInstance, AuthAPI } from '../better-auth.config';
+
+@Injectable()
+export class BetterAuthService {
+  constructor(
+    @Inject('BETTER_AUTH') private readonly auth: BetterAuthInstance,
+    private readonly config: ConfigService
+  ) {}
+
+  // Type-safe access to Better Auth API
+  private get api(): AuthAPI {
+    return this.auth.api;
+  }
+
+  async register(email: string, password: string, name: string) {
+    const result = await this.api.signUpEmail({
+      email,
+      password,
+      name,
+    });
+
+    if (result.error) {
+      throw new UnauthorizedException(result.error.message);
+    }
+
+    return result.data;
+  }
+
+  async login(email: string, password: string) {
+    const result = await this.api.signInEmail({
+      email,
+      password,
+    });
+
+    if (result.error) {
+      throw new UnauthorizedException('Invalid credentials');
+    }
+
+    return result.data;
+  }
+
+  async validateToken(token: string): Promise<{ userId: string; email: string; role: string }> {
+    try {
+      const payload = await this.auth.api.verifyJWT({ token });
+
+      return {
+        userId: payload.sub,
+        email: payload.email,
+        role: payload.role ?? 'user',
+      };
+    } catch (error) {
+      throw new UnauthorizedException('Invalid or expired token');
+    }
+  }
+}
+```
+
+### Organization Management
+
+**Pattern**: Use Better Auth org plugin APIs
+```typescript
+// src/auth/services/better-auth.service.ts (continued)
+
+async createOrganization(userId: string, name: string, slug: string) {
+  const result = await this.api.organization.create({
+    body: { name, slug },
+    headers: { 'user-id': userId } // Better Auth requires user context
+  });
+
+  if (result.error) {
+    throw new BadRequestException(result.error.message);
+  }
+
+  return result.data;
+}
+
+async inviteEmployee(organizationId: string, email: string, role: string, inviterId: string) {
+  const result = await this.api.organization.inviteMember({
+    body: {
+      organizationId,
+      email,
+      role,
+    },
+    headers: { 'user-id': inviterId }
+  });
+
+  if (result.error) {
+    throw new BadRequestException(result.error.message);
+  }
+
+  // Email is sent automatically via sendInvitationEmail hook
+  return result.data;
+}
+
+async setActiveOrganization(userId: string, organizationId: string) {
+  const result = await this.api.organization.setActive({
+    body: { organizationId },
+    headers: { 'user-id': userId }
+  });
+
+  if (result.error) {
+    throw new BadRequestException(result.error.message);
+  }
+
+  return result.data;
+}
+```
+
+### Credit Transaction System
+
+**Pattern**: Use Drizzle transactions with SELECT FOR UPDATE
+```typescript
+// src/credits/credits.service.ts
+import { Injectable } from '@nestjs/common';
+import { InjectDb } from '../db/connection';
+import { PostgresJsDatabase } from 'drizzle-orm/postgres-js';
+import { userCredits, creditTransactions } from '../db/schema/credits.schema';
+import { eq, sql } from 'drizzle-orm';
+
+@Injectable()
+export class CreditsService {
+  constructor(@InjectDb() private readonly db: PostgresJsDatabase) {}
+
+  async useCredits(
+    userId: string,
+    amount: number,
+    service: string,
+    metadata?: Record<string, any>
+  ) {
+    return this.db.transaction(async (tx) => {
+      // Lock the row to prevent race conditions
+      const [user] = await tx
+        .select()
+        .from(userCredits)
+        .where(eq(userCredits.userId, userId))
+        .for('update');
+
+      if (!user) {
+        throw new NotFoundException('User credits not found');
+      }
+
+      if (user.balance < amount) {
+        throw new BadRequestException(
+          `Insufficient credits. Required: ${amount}, Available: ${user.balance}`
+        );
+      }
+
+      // Deduct credits
+      const newBalance = user.balance - amount;
+      await tx
+        .update(userCredits)
+        .set({
+          balance: newBalance,
+          totalUsed: user.totalUsed + amount,
+          updatedAt: new Date(),
+        })
+        .where(eq(userCredits.userId, userId));
+
+      // Log transaction
+      await tx.insert(creditTransactions).values({
+        userId,
+        type: 'usage',
+        amount: -amount,
+        balanceAfter: newBalance,
+        description: `Used ${amount} credits for ${service}`,
+        metadata: { service, ...metadata },
+      });
+
+      return { balance: newBalance };
+    });
+  }
+
+  async allocateCredits(
+    organizationId: string,
+    memberId: string,
+    amount: number,
+    allocatorId: string
+  ) {
+    return this.db.transaction(async (tx) => {
+      // Lock organization credits
+      const [org] = await tx
+        .select()
+        .from(organizationCredits)
+        .where(eq(organizationCredits.organizationId, organizationId))
+        .for('update');
+
+      if (!org || org.balance < amount) {
+        throw new BadRequestException('Insufficient organization credits');
+      }
+
+      // Lock user credits
+      const [user] = await tx
+        .select()
+        .from(userCredits)
+        .where(eq(userCredits.userId, memberId))
+        .for('update');
+
+      if (!user) {
+        throw new NotFoundException('User credits not found');
+      }
+
+      // Deduct from organization
+      const newOrgBalance = org.balance - amount;
+      await tx
+        .update(organizationCredits)
+        .set({
+          balance: newOrgBalance,
+          totalAllocated: org.totalAllocated + amount,
+          updatedAt: new Date(),
+        })
+        .where(eq(organizationCredits.organizationId, organizationId));
+
+      // Add to user
+      const newUserBalance = user.balance + amount;
+      await tx
+        .update(userCredits)
+        .set({
+          balance: newUserBalance,
+          updatedAt: new Date(),
+        })
+        .where(eq(userCredits.userId, memberId));
+
+      // Log both transactions
+      await tx.insert(creditTransactions).values([
+        {
+          organizationId,
+          type: 'allocation',
+          amount: -amount,
+          balanceAfter: newOrgBalance,
+          description: `Allocated ${amount} credits to member`,
+          metadata: { memberId, allocatorId },
+        },
+        {
+          userId: memberId,
+          type: 'allocation',
+          amount: amount,
+          balanceAfter: newUserBalance,
+          description: `Received ${amount} credits from organization`,
+          metadata: { organizationId, allocatorId },
+        },
+      ]);
+
+      return { organizationBalance: newOrgBalance, userBalance: newUserBalance };
+    });
+  }
+}
+```
+
+### Stripe Webhook Integration
+
+**Pattern**: Verify signature, handle idempotency
+```typescript
+// src/credits/credits.controller.ts
+import { Controller, Post, Body, Headers, RawBodyRequest, Req } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import Stripe from 'stripe';
+
+@Controller('webhooks')
+export class WebhooksController {
+  private stripe: Stripe;
+
+  constructor(
+    private readonly creditsService: CreditsService,
+    private readonly config: ConfigService
+  ) {
+    this.stripe = new Stripe(this.config.get('STRIPE_SECRET_KEY'), {
+      apiVersion: '2024-11-20.acacia',
+    });
+  }
+
+  @Post('stripe')
+  async handleStripeWebhook(
+    @Req() req: RawBodyRequest<Request>,
+    @Headers('stripe-signature') signature: string
+  ) {
+    const webhookSecret = this.config.get('STRIPE_WEBHOOK_SECRET');
+
+    let event: Stripe.Event;
+    try {
+      event = this.stripe.webhooks.constructEvent(
+        req.rawBody,
+        signature,
+        webhookSecret
+      );
+    } catch (err) {
+      throw new BadRequestException('Webhook signature verification failed');
+    }
+
+    // Handle different event types
+    switch (event.type) {
+      case 'checkout.session.completed':
+        const session = event.data.object as Stripe.Checkout.Session;
+        await this.handleCheckoutComplete(session);
+        break;
+
+      case 'charge.refunded':
+        const charge = event.data.object as Stripe.Charge;
+        await this.handleRefund(charge);
+        break;
+
+      default:
+        console.log(`Unhandled event type: ${event.type}`);
+    }
+
+    return { received: true };
+  }
+
+  private async handleCheckoutComplete(session: Stripe.Checkout.Session) {
+    const userId = session.metadata.userId;
+    const credits = parseInt(session.metadata.credits);
+
+    // Idempotency: Check if already processed
+    const existing = await this.db
+      .select()
+      .from(creditTransactions)
+      .where(eq(creditTransactions.metadata.stripeSessionId, session.id))
+      .limit(1);
+
+    if (existing.length > 0) {
+      console.log(`Session ${session.id} already processed`);
+      return;
+    }
+
+    // Add credits
+    await this.creditsService.purchaseCredits(userId, credits, {
+      stripeSessionId: session.id,
+      paymentIntent: session.payment_intent,
+      amountPaid: session.amount_total,
+    });
+  }
+
+  private async handleRefund(charge: Stripe.Charge) {
+    // Find original transaction
+    const [transaction] = await this.db
+      .select()
+      .from(creditTransactions)
+      .where(eq(creditTransactions.metadata.paymentIntent, charge.payment_intent))
+      .limit(1);
+
+    if (!transaction) {
+      console.log(`No transaction found for payment intent ${charge.payment_intent}`);
+      return;
+    }
+
+    // Deduct refunded credits
+    await this.creditsService.useCredits(
+      transaction.userId,
+      Math.abs(transaction.amount),
+      'refund',
+      { chargeId: charge.id, reason: charge.refunds.data[0]?.reason }
+    );
+  }
+}
+```
+
+### JWT Validation Guard
+
+**Pattern**: NestJS guard with jose library
+```typescript
+// src/common/guards/jwt-auth.guard.ts
+import { Injectable, CanActivate, ExecutionContext, UnauthorizedException } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import { createRemoteJWKSet, jwtVerify } from 'jose';
+
+@Injectable()
+export class JwtAuthGuard implements CanActivate {
+  private jwks: ReturnType<typeof createRemoteJWKSet>;
+
+  constructor(private config: ConfigService) {
+    const authUrl = this.config.get('MANA_CORE_AUTH_URL') || 'http://localhost:3001';
+    this.jwks = createRemoteJWKSet(new URL(`${authUrl}/api/v1/auth/jwks`));
+  }
+
+  async canActivate(context: ExecutionContext): Promise<boolean> {
+    const request = context.switchToHttp().getRequest();
+    const authHeader = request.headers.authorization;
+
+    if (!authHeader || !authHeader.startsWith('Bearer ')) {
+      throw new UnauthorizedException('Missing or invalid Authorization header');
+    }
+
+    const token = authHeader.substring(7);
+
+    try {
+      const { payload } = await jwtVerify(token, this.jwks, {
+        issuer: this.config.get('JWT_ISSUER') || 'manacore',
+        audience: this.config.get('JWT_AUDIENCE') || 'manacore',
+      });
+
+      // Attach user to request
+      request.user = {
+        userId: payload.sub,
+        email: payload.email,
+        role: payload.role,
+        sessionId: payload.sid,
+      };
+
+      return true;
+    } catch (error) {
+      throw new UnauthorizedException('Invalid or expired token');
+    }
+  }
+}
+```
+
+### Email Integration (Brevo)
+
+**Pattern**: Standalone client for Better Auth hooks
+```typescript
+// src/email/brevo-client.ts
+import { TransactionalEmailsApi, SendSmtpEmail } from '@getbrevo/brevo';
+
+const apiKey = process.env.BREVO_API_KEY;
+const senderEmail = process.env.EMAIL_SENDER_ADDRESS || 'noreply@manacore.app';
+const senderName = process.env.EMAIL_SENDER_NAME || 'ManaCore';
+
+let brevoApi: TransactionalEmailsApi | null = null;
+
+if (apiKey) {
+  brevoApi = new TransactionalEmailsApi();
+  brevoApi.setApiKey(0, apiKey);
+}
+
+export async function sendPasswordResetEmail(data: {
+  email: string;
+  name?: string;
+  resetUrl: string;
+}) {
+  const { email, name, resetUrl } = data;
+
+  if (!brevoApi) {
+    console.log('[DEV MODE] Password reset email (not sent):');
+    console.log(`To: ${email}`);
+    console.log(`Reset URL: ${resetUrl}`);
+    return;
+  }
+
+  const emailData: SendSmtpEmail = {
+    sender: { email: senderEmail, name: senderName },
+    to: [{ email, name: name || email }],
+    subject: 'Reset your ManaCore password',
+    htmlContent: `
+      <h2>Reset your password</h2>
+      <p>Hi ${name || 'there'},</p>
+      <p>Click the link below to reset your password:</p>
+      <a href="${resetUrl}">Reset Password</a>
+      <p>This link expires in 1 hour.</p>
+      <p>If you didn't request this, you can ignore this email.</p>
+    `,
+  };
+
+  await brevoApi.sendTransacEmail(emailData);
+}
+
+export async function sendOrganizationInviteEmail(data: {
+  email: string;
+  organizationName: string;
+  inviterName?: string;
+  inviteUrl: string;
+  role: string;
+}) {
+  const { email, organizationName, inviterName, inviteUrl, role } = data;
+
+  if (!brevoApi) {
+    console.log('[DEV MODE] Organization invite email (not sent):');
+    console.log(`To: ${email}`);
+    console.log(`Organization: ${organizationName}`);
+    console.log(`Role: ${role}`);
+    console.log(`Invite URL: ${inviteUrl}`);
+    return;
+  }
+
+  const emailData: SendSmtpEmail = {
+    sender: { email: senderEmail, name: senderName },
+    to: [{ email }],
+    subject: `You're invited to join ${organizationName} on ManaCore`,
+    htmlContent: `
+      <h2>You've been invited!</h2>
+      <p>${inviterName || 'Someone'} invited you to join <strong>${organizationName}</strong> as a ${role}.</p>
+      <a href="${inviteUrl}">Accept Invitation</a>
+      <p>This invitation expires in 7 days.</p>
+    `,
+  };
+
+  await brevoApi.sendTransacEmail(emailData);
+}
+```
+
+## Common Patterns
+
+### Error Handling (Go-Style)
+```typescript
+// DON'T throw in service layer
+async function getUserBalance(userId: string): Promise<number> {
+  const result = await this.db
+    .select()
+    .from(userCredits)
+    .where(eq(userCredits.userId, userId));
+
+  if (result.length === 0) {
+    throw new NotFoundException('User not found'); // BAD
+  }
+
+  return result[0].balance;
+}
+
+// DO return Result type
+import { Result, ok, err } from '@manacore/shared-errors';
+
+async function getUserBalance(userId: string): Promise<Result<number>> {
+  const result = await this.db
+    .select()
+    .from(userCredits)
+    .where(eq(userCredits.userId, userId));
+
+  if (result.length === 0) {
+    return err('USER_NOT_FOUND', 'User not found');
+  }
+
+  return ok(result[0].balance);
+}
+```
+
+### Testing Critical Flows
+```typescript
+// src/auth/__tests__/auth-flow.spec.ts
+describe('Authentication Flow', () => {
+  it('should register user and return JWT', async () => {
+    const result = await betterAuthService.register(
+      'test@example.com',
+      'securePassword123',
+      'Test User'
+    );
+
+    expect(result.user).toBeDefined();
+    expect(result.user.email).toBe('test@example.com');
+    expect(result.session).toBeDefined();
+    expect(result.session.token).toBeDefined();
+  });
+
+  it('should validate JWT and return user data', async () => {
+    // Register and get token
+    const { session } = await betterAuthService.register(...);
+
+    // Validate token
+    const userData = await betterAuthService.validateToken(session.token);
+
+    expect(userData.userId).toBeDefined();
+    expect(userData.email).toBe('test@example.com');
+    expect(userData.role).toBe('user');
+  });
+
+  it('should prevent credit double-spend with concurrent requests', async () => {
+    // Setup user with 100 credits
+    await creditsService.addCredits(userId, 100);
+
+    // Attempt concurrent deductions of 60 credits each
+    const [result1, result2] = await Promise.allSettled([
+      creditsService.useCredits(userId, 60, 'chat'),
+      creditsService.useCredits(userId, 60, 'chat'),
+    ]);
+
+    // One should succeed, one should fail
+    expect(result1.status === 'fulfilled' && result2.status === 'rejected' ||
+           result1.status === 'rejected' && result2.status === 'fulfilled').toBe(true);
+
+    // Final balance should be 40 (100 - 60)
+    const balance = await creditsService.getBalance(userId);
+    expect(balance).toBe(40);
+  });
+});
+```
+
+## Code Review Checklist
+
+### Security
+- [ ] User ID from JWT, not request body
+- [ ] Input validated with DTOs
+- [ ] Passwords never logged or exposed
+- [ ] Stripe webhook signature verified
+- [ ] Database queries use parameterized queries (Drizzle handles this)
+
+### Better Auth Integration
+- [ ] Use Better Auth APIs, not custom auth logic
+- [ ] Use inferred types from better-auth.config.ts
+- [ ] Don't add fields to JWT claims (use APIs instead)
+- [ ] Email hooks use standalone Brevo client (not NestJS service)
+
+### Credit Transactions
+- [ ] All credit operations use transactions
+- [ ] Row locking with SELECT FOR UPDATE
+- [ ] Balance checks before deduction
+- [ ] Transaction log entries created
+- [ ] Idempotency for Stripe webhooks
+
+## How to Invoke
+```
+"As the Senior Developer for mana-core-auth, implement password reset..."
+"As the Senior Developer for mana-core-auth, review this credit transaction code..."
+"As the Senior Developer for mana-core-auth, write integration tests for..."
+```