feat: Add task-mcp server for task management via MCP

Implements 10 MCP tools for task management:
- CRUD: task_add, task_list, task_show, task_close, task_update
- Search: task_similar (pgvector), task_context
- Relations: task_link, task_checklist_add, task_checklist_toggle

Uses PostgreSQL with pgvector for semantic search via LiteLLM embeddings.
Connects via SSH tunnel to docker-host:5435.

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

src/tools/index.ts

@@ -0,0 +1,138 @@
+// Tool definitions for task-mcp
+
+export const toolDefinitions = [
+  // CRUD Tools
+  {
+    name: 'task_add',
+    description: 'Create a new task with auto-generated ID and semantic embedding',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        title: { type: 'string', description: 'Task title (required)' },
+        project: { type: 'string', description: 'Project key (e.g., ST, VPN). Auto-detected from CWD if not provided.' },
+        type: { type: 'string', enum: ['task', 'bug', 'feature', 'debt'], description: 'Task type (default: task)' },
+        priority: { type: 'string', enum: ['P0', 'P1', 'P2', 'P3'], description: 'Priority level (default: P2)' },
+        description: { type: 'string', description: 'Optional description' },
+      },
+      required: ['title'],
+    },
+  },
+  {
+    name: 'task_list',
+    description: 'List tasks with optional filters',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        project: { type: 'string', description: 'Filter by project key' },
+        status: { type: 'string', enum: ['open', 'in_progress', 'blocked', 'completed'], description: 'Filter by status' },
+        type: { type: 'string', enum: ['task', 'bug', 'feature', 'debt'], description: 'Filter by type' },
+        priority: { type: 'string', enum: ['P0', 'P1', 'P2', 'P3'], description: 'Filter by priority' },
+        limit: { type: 'number', description: 'Max results (default: 20)' },
+      },
+    },
+  },
+  {
+    name: 'task_show',
+    description: 'Show task details including checklist and dependencies',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        id: { type: 'string', description: 'Task ID (e.g., ST-1, VPN-45)' },
+      },
+      required: ['id'],
+    },
+  },
+  {
+    name: 'task_close',
+    description: 'Mark a task as completed',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        id: { type: 'string', description: 'Task ID to close' },
+      },
+      required: ['id'],
+    },
+  },
+  {
+    name: 'task_update',
+    description: 'Update task fields (status, priority, type, title)',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        id: { type: 'string', description: 'Task ID to update' },
+        status: { type: 'string', enum: ['open', 'in_progress', 'blocked', 'completed'], description: 'New status' },
+        priority: { type: 'string', enum: ['P0', 'P1', 'P2', 'P3'], description: 'New priority' },
+        type: { type: 'string', enum: ['task', 'bug', 'feature', 'debt'], description: 'New type' },
+        title: { type: 'string', description: 'New title' },
+      },
+      required: ['id'],
+    },
+  },
+
+  // Semantic Search Tools
+  {
+    name: 'task_similar',
+    description: 'Find semantically similar tasks using pgvector',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        query: { type: 'string', description: 'Search query' },
+        project: { type: 'string', description: 'Filter by project (optional)' },
+        limit: { type: 'number', description: 'Max results (default: 5)' },
+      },
+      required: ['query'],
+    },
+  },
+  {
+    name: 'task_context',
+    description: 'Get related tasks for current work context (useful for delegations)',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        description: { type: 'string', description: 'Description of current work' },
+        project: { type: 'string', description: 'Current project' },
+        limit: { type: 'number', description: 'Max related tasks (default: 3)' },
+      },
+      required: ['description'],
+    },
+  },
+
+  // Relation Tools
+  {
+    name: 'task_link',
+    description: 'Create dependency between tasks',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        from_id: { type: 'string', description: 'Source task ID' },
+        to_id: { type: 'string', description: 'Target task ID' },
+        link_type: { type: 'string', enum: ['blocks', 'relates_to', 'duplicates'], description: 'Relationship type' },
+      },
+      required: ['from_id', 'to_id', 'link_type'],
+    },
+  },
+  {
+    name: 'task_checklist_add',
+    description: 'Add a checklist item to a task',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        task_id: { type: 'string', description: 'Task ID' },
+        item: { type: 'string', description: 'Checklist item text' },
+      },
+      required: ['task_id', 'item'],
+    },
+  },
+  {
+    name: 'task_checklist_toggle',
+    description: 'Toggle a checklist item (check/uncheck)',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        item_id: { type: 'number', description: 'Checklist item ID' },
+        checked: { type: 'boolean', description: 'New checked state' },
+      },
+      required: ['item_id', 'checked'],
+    },
+  },
+];