feat: Read My Mind phase 1, per-case intent profiles (capture + API + skill)

Per-case profiles of user intent (docs/readmymind-plan.md): user-stated goals
plus the user's recently submitted prompts, captured from the Claude session
transcript behind the new synced readMyMindEnabled setting (default OFF).

- intent-store.ts: keyed by owner + realpath(workingDir), FIFO/size caps,
  consecutive-dupe collapse, atomic 0600 writes to ~/.codeman/intents.json
- transcript-watcher.ts: new transcript:user_prompt event for typed user turns
  (tool_result-only entries stay silent); capture wiring in server.ts is
  claude-only and gated on the setting per event
- readmymind-routes.ts: GET/PUT/DELETE /api/sessions/:id/intent, ownership
  via findSessionOrFail, strict Zod schema
- agent skill: SKILL.md recipe + endpoints.md rows so agents can read and
  record intent (PUT replaces: read + merge; never delete unprompted)
- groundwork for the phase-2 predictor button; nothing is ever auto-sent

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/web/routes/index.ts

@@ -11,6 +11,7 @@ export { registerCronRoutes } from './cron-routes.js';
 export { registerSystemRoutes } from './system-routes.js';
 export { registerHookEventRoutes } from './hook-event-routes.js';
 export { registerApprovalRoutes } from './approval-routes.js';
+export { registerReadMyMindRoutes } from './readmymind-routes.js';
 export { registerStatusTelemetryRoutes } from './status-telemetry-routes.js';
 export { registerCaseRoutes } from './case-routes.js';
 export { registerSessionRoutes } from './session-routes.js';

src/web/routes/readmymind-routes.ts

@@ -0,0 +1,50 @@
+/**
+ * @fileoverview Read My Mind intent routes.
+ *
+ * Per-case intent profiles feeding the Read My Mind predictor
+ * (docs/readmymind-plan.md):
+ * - `GET    /api/sessions/:id/intent`: the profile for the session's case
+ * - `PUT    /api/sessions/:id/intent`: replace the goals text
+ * - `DELETE /api/sessions/:id/intent`: forget the case's profile
+ *
+ * The profile is keyed by owner + workingDir, so multi-user scoping is
+ * structural; session ownership is still enforced via `findSessionOrFail`
+ * (with `req`, so a foreign session id 404s) to keep the session-routes
+ * no-existence-leak policy.
+ *
+ * Deliberately session-scoped rather than a raw `/api/intents/:key` surface:
+ * the session resolves owner + workingDir server-side, so a caller can never
+ * address another case's profile by guessing keys.
+ *
+ * Registrations use the bare `app.<method>('path', ...)` + `req.params as`
+ * shape (session-routes style): these endpoints are documented in the agent
+ * skill, and the endpoints.md drift test's scanner does not see registrations
+ * with a generic between the method and the path.
+ */
+
+import { FastifyInstance } from 'fastify';
+import { IntentGoalsSchema } from '../schemas.js';
+import { parseBody, findSessionOrFail } from '../route-helpers.js';
+import { intentStore } from '../../intent-store.js';
+import type { SessionPort } from '../ports/index.js';
+
+export function registerReadMyMindRoutes(app: FastifyInstance, ctx: SessionPort): void {
+  app.get('/api/sessions/:id/intent', async (req) => {
+    const { id } = req.params as { id: string };
+    const session = findSessionOrFail(ctx, id, req);
+    return { success: true, data: { intent: intentStore.getProfile(session.owner, session.workingDir) } };
+  });
+
+  app.put('/api/sessions/:id/intent', async (req) => {
+    const { id } = req.params as { id: string };
+    const body = parseBody(IntentGoalsSchema, req.body);
+    const session = findSessionOrFail(ctx, id, req);
+    return { success: true, data: { intent: intentStore.setGoals(session.owner, session.workingDir, body.goals) } };
+  });
+
+  app.delete('/api/sessions/:id/intent', async (req) => {
+    const { id } = req.params as { id: string };
+    const session = findSessionOrFail(ctx, id, req);
+    return { success: true, data: { deleted: intentStore.deleteProfile(session.owner, session.workingDir) } };
+  });
+}