batch3 T3: broker user channel + /api/ws/user + project/session/inference emits

- broker.subscribeUser/publishUser via separate user topics map
- /api/ws/user WS route subscribes to the user channel
- projects/sessions POST/DELETE handlers emit lifecycle frames
- inference 3 terminal-state sites emit session_updated with RETURNING

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

apps/server/src/routes/projects.ts

@@ -4,6 +4,7 @@ import { realpath, stat, readdir, access } from 'node:fs/promises';
 import { basename, resolve, sep } from 'node:path';
 import type { Sql } from '../db.js';
 import type { Config } from '../config.js';
+import type { Broker } from '../services/broker.js';
 import type { Project, AvailableProject } from '../types/api.js';
 
 const AddProjectBody = z.object({
@@ -42,7 +43,8 @@ async function resolveProjectPath(
 export function registerProjectRoutes(
   app: FastifyInstance,
   sql: Sql,
-  config: Config
+  config: Config,
+  broker: Broker
 ): void {
   app.get('/api/projects', async () => {
     const rows = await sql<Project[]>`
@@ -71,6 +73,7 @@ export function registerProjectRoutes(
         VALUES (${name}, ${resolved.real})
         RETURNING id, name, path, added_at, last_session_id
       `;
+      broker.publishUser(req.user!, { type: 'project_created', project: row as unknown as Project });
       reply.code(201);
       return row;
     } catch (err) {
@@ -89,6 +92,7 @@ export function registerProjectRoutes(
       reply.code(404);
       return { error: 'not found' };
     }
+    broker.publishUser(req.user!, { type: 'project_deleted', project_id: id });
     reply.code(204);
     return null;
   });