feat: auth middleware, brain data layer, Valkey queue (P1-002/003/004) (#71)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

packages/brain/src/brain.ts

@@ -0,0 +1,21 @@
+import type { Db } from '@mosaic/db';
+import { createProjectsRepo, type ProjectsRepo } from './projects.js';
+import { createMissionsRepo, type MissionsRepo } from './missions.js';
+import { createTasksRepo, type TasksRepo } from './tasks.js';
+import { createConversationsRepo, type ConversationsRepo } from './conversations.js';
+
+export interface Brain {
+  projects: ProjectsRepo;
+  missions: MissionsRepo;
+  tasks: TasksRepo;
+  conversations: ConversationsRepo;
+}
+
+export function createBrain(db: Db): Brain {
+  return {
+    projects: createProjectsRepo(db),
+    missions: createMissionsRepo(db),
+    tasks: createTasksRepo(db),
+    conversations: createConversationsRepo(db),
+  };
+}