feat: Add errands schema, repository, and wire into tRPC context/container

Creates the errands table (with conflictFiles column), errand-repository
port interface, DrizzleErrandRepository adapter, and wires the repository
into TRPCContext, the DI container, _helpers.ts requireErrandRepository guard,
and the test harness. Also fixes pre-existing TS error in controller.test.ts.

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

apps/server/test/harness.ts

@@ -25,6 +25,7 @@ import type { MessageRepository } from '../db/repositories/message-repository.js
 import type { AgentRepository } from '../db/repositories/agent-repository.js';
 import type { InitiativeRepository } from '../db/repositories/initiative-repository.js';
 import type { PhaseRepository } from '../db/repositories/phase-repository.js';
+import type { ErrandRepository } from '../db/repositories/errand-repository.js';
 import type { Initiative, Phase, Task } from '../db/schema.js';
 import { createTestDatabase } from '../db/repositories/drizzle/test-helpers.js';
 import { createRepositories } from '../container.js';
@@ -204,6 +205,8 @@ export interface TestHarness {
   initiativeRepository: InitiativeRepository;
   /** Phase repository */
   phaseRepository: PhaseRepository;
+  /** Errand repository */
+  errandRepository: ErrandRepository;
 
   // tRPC Caller
   /** tRPC caller for direct procedure calls */
@@ -409,7 +412,7 @@ export function createTestHarness(): TestHarness {
 
   // Create repositories
   const repos = createRepositories(db);
-  const { taskRepository, messageRepository, agentRepository, initiativeRepository, phaseRepository } = repos;
+  const { taskRepository, messageRepository, agentRepository, initiativeRepository, phaseRepository, errandRepository } = repos;
 
   // Create real managers wired to mocks
   const dispatchManager = new DefaultDispatchManager(
@@ -447,6 +450,7 @@ export function createTestHarness(): TestHarness {
     coordinationManager,
     initiativeRepository,
     phaseRepository,
+    errandRepository,
   });
 
   // Create tRPC caller
@@ -470,6 +474,7 @@ export function createTestHarness(): TestHarness {
     agentRepository,
     initiativeRepository,
     phaseRepository,
+    errandRepository,
 
     // tRPC Caller
     caller,