feat: Add project lock mechanism for session exclusivity

New MCP tools:
- project_lock: Lock a project for exclusive session access
- project_unlock: Release a project lock
- project_lock_status: Check lock status for project(s)

Features:
- Automatic lock expiration (default 2h)
- Session ownership verification
- Force unlock option for emergencies
- Lock extension on re-lock by same session

Migration 004: project_locks table with expiry tracking

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/index.ts

@@ -23,6 +23,7 @@ import { taskSimilar, taskContext } from './tools/search.js';
 import { taskLink, checklistAdd, checklistToggle, taskResolveDuplicate } from './tools/relations.js';
 import { epicAdd, epicList, epicShow, epicAssign, epicClose } from './tools/epics.js';
 import { taskDelegations, taskDelegationQuery } from './tools/delegations.js';
+import { projectLock, projectUnlock, projectLockStatus } from './tools/locks.js';
 
 // Create MCP server
 const server = new Server(
@@ -163,6 +164,28 @@ server.setRequestHandler(CallToolRequestSchema, async (request) => {
         });
         break;
 
+      // Project Locks
+      case 'project_lock':
+        result = await projectLock({
+          project: a.project,
+          session_id: a.session_id,
+          duration_minutes: a.duration_minutes,
+          reason: a.reason,
+        });
+        break;
+      case 'project_unlock':
+        result = await projectUnlock({
+          project: a.project,
+          session_id: a.session_id,
+          force: a.force,
+        });
+        break;
+      case 'project_lock_status':
+        result = await projectLockStatus({
+          project: a.project,
+        });
+        break;
+
       default:
         throw new Error(`Unknown tool: ${name}`);
     }