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/types.ts

@@ -0,0 +1,71 @@
+// Task Management Types
+
+export interface Task {
+  id: string;
+  project: string;
+  title: string;
+  description?: string;
+  type: 'task' | 'bug' | 'feature' | 'debt';
+  status: 'open' | 'in_progress' | 'blocked' | 'completed';
+  priority: 'P0' | 'P1' | 'P2' | 'P3';
+  version_id?: string;
+  epic_id?: string;
+  created_at: Date;
+  updated_at: Date;
+  completed_at?: Date;
+}
+
+export interface Project {
+  key: string;
+  name: string;
+  path?: string;
+  active: boolean;
+  created_at: Date;
+}
+
+export interface ChecklistItem {
+  id: number;
+  task_id: string;
+  item: string;
+  checked: boolean;
+  position: number;
+  created_at: Date;
+}
+
+export interface TaskLink {
+  id: number;
+  from_task_id: string;
+  to_task_id: string;
+  link_type: 'blocks' | 'relates_to' | 'duplicates';
+  created_at: Date;
+}
+
+export interface Version {
+  id: string;
+  project: string;
+  version: string;
+  build_number?: number;
+  status: 'planned' | 'in_progress' | 'released' | 'archived';
+  release_date?: Date;
+  release_notes?: string;
+  created_at: Date;
+}
+
+export interface Epic {
+  id: string;
+  project: string;
+  title: string;
+  description?: string;
+  status: 'open' | 'in_progress' | 'completed';
+  target_version_id?: string;
+  created_at: Date;
+}
+
+export interface SimilarTask {
+  id: string;
+  title: string;
+  type: string;
+  status: string;
+  priority: string;
+  similarity: number;
+}