Add tool documentation MCP tools for queryable TOOLS.md replacement

- Created tool_docs table with pgvector support (migration 015)
- Added 5 MCP tools: tool_doc_add, tool_doc_search, tool_doc_get, tool_doc_list, tool_doc_export
- Imported 268 tools from TOOLS.md to database
- Enables semantic search for tool documentation (when embeddings available)
- Reduces context pollution (TOOLS.md is 11,769 lines, now queryable)

Task: CF-249

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

src/tools/index.ts

@@ -644,6 +644,72 @@ export const toolDefinitions = [
     },
   },
 
+  // Tool Documentation Tools
+  {
+    name: 'tool_doc_add',
+    description: 'Add a new tool documentation entry',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        tool_name: { type: 'string', description: 'Tool or command name' },
+        category: { type: 'string', enum: ['mcp', 'cli', 'script', 'internal', 'deprecated'], description: 'Tool category' },
+        title: { type: 'string', description: 'Short descriptive title' },
+        description: { type: 'string', description: 'Detailed description of what the tool does' },
+        usage_example: { type: 'string', description: 'Usage example (optional)' },
+        parameters: { type: 'object', description: 'Parameter definitions (optional)' },
+        notes: { type: 'string', description: 'Additional notes, gotchas, tips (optional)' },
+        tags: { type: 'array', items: { type: 'string' }, description: 'Searchable tags (optional)' },
+        source_file: { type: 'string', description: 'Original source file (optional)' },
+      },
+      required: ['tool_name', 'category', 'title', 'description'],
+    },
+  },
+  {
+    name: 'tool_doc_search',
+    description: 'Search tool documentation semantically',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        query: { type: 'string', description: 'Search query' },
+        category: { type: 'string', enum: ['mcp', 'cli', 'script', 'internal', 'deprecated'], description: 'Filter by category (optional)' },
+        tags: { type: 'array', items: { type: 'string' }, description: 'Filter by tags (optional)' },
+        limit: { type: 'number', description: 'Max results (default: 5)' },
+      },
+      required: ['query'],
+    },
+  },
+  {
+    name: 'tool_doc_get',
+    description: 'Get specific tool documentation by name',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        tool_name: { type: 'string', description: 'Tool or command name' },
+      },
+      required: ['tool_name'],
+    },
+  },
+  {
+    name: 'tool_doc_list',
+    description: 'List tool documentation entries',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        category: { type: 'string', enum: ['mcp', 'cli', 'script', 'internal', 'deprecated'], description: 'Filter by category (optional)' },
+        tag: { type: 'string', description: 'Filter by tag (optional)' },
+        limit: { type: 'number', description: 'Max results (default: 20)' },
+      },
+    },
+  },
+  {
+    name: 'tool_doc_export',
+    description: 'Export all tool documentation as markdown (for backup/migration)',
+    inputSchema: {
+      type: 'object',
+      properties: {},
+    },
+  },
+
   // Session Management Tools
   {
     name: 'session_start',