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/index.ts

@@ -38,6 +38,7 @@ import {
   componentGraph,
 } from './tools/impact.js';
 import { memoryAdd, memorySearch, memoryList, memoryContext } from './tools/memories.js';
+import { toolDocAdd, toolDocSearch, toolDocGet, toolDocList, toolDocExport } from './tools/tool-docs.js';
 import {
   sessionStart,
   sessionUpdate,
@@ -374,6 +375,44 @@ server.setRequestHandler(CallToolRequestSchema, async (request) => {
         result = await memoryContext(a.project, a.task_description);
         break;
 
+      // Tool Documentation
+      case 'tool_doc_add':
+        result = await toolDocAdd({
+          tool_name: a.tool_name,
+          category: a.category,
+          title: a.title,
+          description: a.description,
+          usage_example: a.usage_example,
+          parameters: a.parameters,
+          notes: a.notes,
+          tags: a.tags,
+          source_file: a.source_file,
+        });
+        break;
+      case 'tool_doc_search':
+        result = await toolDocSearch({
+          query: a.query,
+          category: a.category,
+          tags: a.tags,
+          limit: a.limit,
+        });
+        break;
+      case 'tool_doc_get':
+        result = await toolDocGet({
+          tool_name: a.tool_name,
+        });
+        break;
+      case 'tool_doc_list':
+        result = await toolDocList({
+          category: a.category,
+          tag: a.tag,
+          limit: a.limit,
+        });
+        break;
+      case 'tool_doc_export':
+        result = await toolDocExport();
+        break;
+
       // Sessions
       case 'session_start':
         result = await sessionStart({