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>

README.md

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+# Task MCP Server
+
+Exposes task management tools via Model Context Protocol. Uses PostgreSQL with pgvector for semantic search.
+
+## Requirements
+
+- SSH tunnel to docker-host: `ssh -L 5435:localhost:5435 docker-host -N &`
+- PostgreSQL with pgvector on docker-host (litellm-pgvector container)
+
+## Configuration
+
+Add to `~/.claude/mcp_servers.json`:
+
+```json
+{
+  "task-mcp": {
+    "command": "node",
+    "args": ["/path/to/task-mcp/dist/index.js"],
+    "env": {
+      "DB_HOST": "localhost",
+      "DB_PORT": "5435",
+      "DB_NAME": "litellm",
+      "DB_USER": "litellm",
+      "DB_PASSWORD": "litellm",
+      "LLM_API_URL": "https://llm.agiliton.cloud",
+      "LLM_API_KEY": "sk-master-..."
+    }
+  }
+}
+```
+
+## Tools
+
+| Tool | Description |
+|------|-------------|
+| `task_add` | Create task with auto-generated ID and embedding |
+| `task_list` | List tasks with filters (project, status, type, priority) |
+| `task_show` | Show task details including checklist and dependencies |
+| `task_close` | Mark task as completed |
+| `task_update` | Update task fields |
+| `task_similar` | Find semantically similar tasks using pgvector |
+| `task_context` | Get related tasks for current work context |
+| `task_link` | Create dependency between tasks |
+| `task_checklist_add` | Add checklist item to task |
+| `task_checklist_toggle` | Toggle checklist item |
+
+## Build
+
+```bash
+npm install
+npm run build
+```
+
+## Development
+
+```bash
+npm run dev  # Run with tsx (no build)
+```