test(ai): promote MockLlmClient to a shared @mana/shared-ai export

The runPlannerLoop test file and the webapp's mission-runner test each
had their own inline scripted LLM mock — same interface, diverged
slightly. Consolidates into packages/shared-ai/src/planner/mock-llm.ts
and re-exports from the package root so any consumer can drive the
loop deterministically.

Both existing test files now use the shared client. 5 + 3 tests pass,
44 total in shared-ai still green.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/shared-ai/src/index.ts

@@ -82,6 +82,7 @@ export type {
 export {
 	buildPlannerPrompt,
 	buildSystemPrompt,
+	MockLlmClient,
 	parsePlannerResponse,
 	runPlannerLoop,
 } from './planner';

packages/shared-ai/src/planner/index.ts

@@ -10,6 +10,8 @@ export type { AiPlanInput, AiPlanOutput, AvailableTool, PlannedStep, ResolvedInp
 export { buildSystemPrompt } from './system-prompt';
 export type { SystemPromptInput, SystemPromptOutput } from './system-prompt';
 export { runPlannerLoop } from './loop';
+export { MockLlmClient } from './mock-llm';
+export type { MockLlmTurn } from './mock-llm';
 export type {
 	ChatMessage,
 	ChatRole,

packages/shared-ai/src/planner/loop.test.ts

@@ -1,58 +1,8 @@
 import { describe, expect, it, vi } from 'vitest';
-import {
-	runPlannerLoop,
-	type ChatMessage,
-	type LlmClient,
-	type LlmCompletionResponse,
-	type ToolCallRequest,
-	type ToolResult,
-} from './loop';
+import { runPlannerLoop, type ToolCallRequest, type ToolResult } from './loop';
+import { MockLlmClient } from './mock-llm';
 import type { ToolSchema } from '../tools/schemas';
 
-/**
- * Scriptable mock LLM — each ``enqueue*`` call pushes one planned
- * response onto a FIFO. The loop pulls responses in order. If the loop
- * asks for more turns than we enqueued, the test fails loudly rather
- * than hanging.
- */
-class MockLlm implements LlmClient {
-	private queue: LlmCompletionResponse[] = [];
-	public calls: Array<{ messages: readonly ChatMessage[]; toolNames: string[] }> = [];
-
-	enqueueToolCalls(calls: Array<{ name: string; args: Record<string, unknown> }>): this {
-		this.queue.push({
-			content: null,
-			toolCalls: calls.map((c, i) => ({
-				id: `call_${this.queue.length}_${i}`,
-				name: c.name,
-				arguments: c.args,
-			})),
-			finishReason: 'tool_calls',
-		});
-		return this;
-	}
-
-	enqueueStop(content: string | null = null): this {
-		this.queue.push({ content, toolCalls: [], finishReason: 'stop' });
-		return this;
-	}
-
-	async complete(req: {
-		messages: readonly ChatMessage[];
-		tools: readonly unknown[];
-	}): Promise<LlmCompletionResponse> {
-		// Snapshot at call time — the loop mutates the same array after,
-		// and we want to assert the state the LLM actually saw.
-		this.calls.push({
-			messages: [...req.messages],
-			toolNames: (req.tools as Array<{ function: { name: string } }>).map((t) => t.function.name),
-		});
-		const next = this.queue.shift();
-		if (!next) throw new Error('MockLlm: no more responses enqueued');
-		return next;
-	}
-}
-
 const tools: ToolSchema[] = [
 	{
 		name: 'list_things',
@@ -72,7 +22,7 @@ const tools: ToolSchema[] = [
 
 describe('runPlannerLoop', () => {
 	it('stops immediately when the LLM emits no tool_calls', async () => {
-		const llm = new MockLlm().enqueueStop('done');
+		const llm = new MockLlmClient().enqueueStop('done');
 		const onToolCall = vi.fn();
 		const result = await runPlannerLoop({
 			llm,
@@ -92,7 +42,7 @@ describe('runPlannerLoop', () => {
 	});
 
 	it('executes a single tool call and feeds the result back', async () => {
-		const llm = new MockLlm()
+		const llm = new MockLlmClient()
 			.enqueueToolCalls([{ name: 'list_things', args: {} }])
 			.enqueueStop('all done');
 
@@ -124,7 +74,7 @@ describe('runPlannerLoop', () => {
 	});
 
 	it('executes parallel tool calls sequentially', async () => {
-		const llm = new MockLlm()
+		const llm = new MockLlmClient()
 			.enqueueToolCalls([
 				{ name: 'create_thing', args: { title: 'a' } },
 				{ name: 'create_thing', args: { title: 'b' } },
@@ -149,7 +99,7 @@ describe('runPlannerLoop', () => {
 	});
 
 	it('propagates tool failures as tool-messages (LLM can react)', async () => {
-		const llm = new MockLlm()
+		const llm = new MockLlmClient()
 			.enqueueToolCalls([{ name: 'list_things', args: {} }])
 			.enqueueStop('ack');
 
@@ -171,7 +121,7 @@ describe('runPlannerLoop', () => {
 	});
 
 	it('honours the maxRounds ceiling', async () => {
-		const llm = new MockLlm();
+		const llm = new MockLlmClient();
 		// Seed enough tool-call turns to exceed the cap
 		for (let i = 0; i < 10; i++) {
 			llm.enqueueToolCalls([{ name: 'list_things', args: {} }]);

packages/shared-ai/src/planner/mock-llm.ts

@@ -0,0 +1,50 @@
+/**
+ * Scriptable MockLlmClient — drives runPlannerLoop in tests without
+ * hitting a real LLM. Each ``enqueue*`` call queues one assistant
+ * turn; the loop consumes them FIFO. Unscripted turns throw loudly
+ * so tests fail fast instead of hanging.
+ */
+
+import type { ChatMessage, LlmClient, LlmCompletionRequest, LlmCompletionResponse } from './loop';
+
+export interface MockLlmTurn {
+	messages: readonly ChatMessage[];
+	toolNames: string[];
+}
+
+export class MockLlmClient implements LlmClient {
+	private queue: LlmCompletionResponse[] = [];
+	/** Snapshots of each inbound call. Use to assert what the LLM saw
+	 *  on each round (messages + tool schemas). */
+	public readonly calls: MockLlmTurn[] = [];
+
+	enqueueToolCalls(calls: Array<{ name: string; args: Record<string, unknown> }>): this {
+		this.queue.push({
+			content: null,
+			toolCalls: calls.map((c, i) => ({
+				id: `call_${this.queue.length}_${i}`,
+				name: c.name,
+				arguments: c.args,
+			})),
+			finishReason: 'tool_calls',
+		});
+		return this;
+	}
+
+	enqueueStop(content: string | null = null): this {
+		this.queue.push({ content, toolCalls: [], finishReason: 'stop' });
+		return this;
+	}
+
+	async complete(req: LlmCompletionRequest): Promise<LlmCompletionResponse> {
+		// Snapshot at call-time — the loop mutates the array after, and
+		// tests want to assert the state the LLM actually saw.
+		this.calls.push({
+			messages: [...req.messages],
+			toolNames: req.tools.map((t) => t.function.name),
+		});
+		const next = this.queue.shift();
+		if (!next) throw new Error('MockLlmClient: no more responses enqueued');
+		return next;
+	}
+}