feat(versioning): add semantic versioning and changesets to all apps

Assign version numbers based on app maturity: Calendar/Contacts/Todo (1.0.0),
Chat/Picture (0.3.0), 11 beta apps (0.2.0), Context/Planta/Questions (0.1.0),
Traces (0.0.1). Set up @changesets/cli for future version management.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/VERSIONING.md

@@ -0,0 +1,103 @@
+# Versioning Strategy
+
+## Overview
+
+This monorepo uses **independent semantic versioning** per app, managed by [Changesets](https://github.com/changesets/changesets).
+
+## Semantic Versioning (SemVer)
+
+All apps follow `MAJOR.MINOR.PATCH`:
+- **MAJOR** (1.x.x): Breaking changes, major rewrites
+- **MINOR** (x.1.x): New features, significant improvements
+- **PATCH** (x.x.1): Bug fixes, minor improvements
+
+## Version Tiers
+
+| Tier | Range | Criteria |
+|------|-------|----------|
+| **Production** | 1.0.0+ | Audit >=85, Tests >=80%, deployed 2+ months |
+| **Stable Beta** | 0.3.0+ | Deployed, audit >=75, has tests |
+| **Beta** | 0.2.0+ | Functional, deployed or ready to deploy |
+| **Early Beta** | 0.1.0+ | Core features working, architecture solid |
+| **Alpha** | 0.0.x | Early development, experimental |
+
+## Current Versions
+
+### Apps
+
+| App | Version | Status |
+|-----|---------|--------|
+| Calendar | 1.0.0 | Production |
+| Contacts | 1.0.0 | Production |
+| Todo | 1.0.0 | Production |
+| Chat | 0.3.0 | Stable Beta |
+| Picture | 0.3.0 | Stable Beta |
+| Mukke | 0.2.0 | Beta |
+| Zitare | 0.2.0 | Beta |
+| Clock | 0.2.0 | Beta |
+| Nutriphi | 0.2.0 | Beta |
+| ManaDeck | 0.2.0 | Beta |
+| ManaCore | 0.2.0 | Beta |
+| Matrix | 0.2.0 | Beta |
+| Photos | 0.2.0 | Beta |
+| Skilltree | 0.2.0 | Beta |
+| Presi | 0.2.0 | Beta |
+| Storage | 0.2.0 | Beta |
+| Context | 0.1.0 | Early Beta |
+| Planta | 0.1.0 | Early Beta |
+| Questions | 0.1.0 | Early Beta |
+| Traces | 0.0.1 | Alpha |
+
+### Services
+
+| Service | Version | Status |
+|---------|---------|--------|
+| mana-core-auth | 1.0.0 | Production |
+| mana-search | 0.1.0 | Early Beta |
+| mana-crawler | 0.1.0 | Early Beta |
+| mana-llm | 0.0.1 | Alpha |
+| mana-notify | 0.0.1 | Alpha |
+
+## How to Use
+
+### Creating a Changeset
+
+After making changes, run:
+
+```bash
+pnpm changeset
+```
+
+This prompts you to:
+1. Select which packages changed
+2. Choose bump type (major/minor/patch)
+3. Write a summary of changes
+
+### Applying Version Bumps
+
+```bash
+pnpm version:bump
+```
+
+This reads pending changesets, bumps versions, and updates CHANGELOGs.
+
+### Checking Status
+
+```bash
+pnpm version:status
+```
+
+Shows pending changesets and which packages will be bumped.
+
+## Mobile App Versioning
+
+Mobile apps (Expo) use EAS Build with `appVersionSource: "remote"` and `autoIncrement: true` for production builds. The `version` in app.json matches the package.json version, while buildNumber/versionCode are managed by EAS.
+
+## Graduation Criteria
+
+To move up a version tier:
+
+- **Alpha -> Early Beta (0.1.0)**: Core features implemented, good architecture
+- **Early Beta -> Beta (0.2.0)**: Deployed or ready, audit >55
+- **Beta -> Stable Beta (0.3.0)**: Deployed, audit >=75, has tests
+- **Stable Beta -> Production (1.0.0)**: Audit >=85, tests >=80%, deployed 2+ months, zero critical bugs for 1 month