feat: Add session memory system with pgvector

- Add session_memories table for persistent learnings
- Add memory_add, memory_search, memory_list, memory_context tools
- Supports semantic search via embeddings
- Categories: pattern, fix, preference, gotcha, architecture

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

src/index.ts

@@ -36,6 +36,7 @@ import {
   impactLearn,
   componentGraph,
 } from './tools/impact.js';
+import { memoryAdd, memorySearch, memoryList, memoryContext } from './tools/memories.js';
 
 // Create MCP server
 const server = new Server(
@@ -320,6 +321,35 @@ server.setRequestHandler(CallToolRequestSchema, async (request) => {
         result = JSON.stringify(await componentGraph(a.component_id), null, 2);
         break;
 
+      // Memories
+      case 'memory_add':
+        result = await memoryAdd({
+          category: a.category,
+          title: a.title,
+          content: a.content,
+          context: a.context,
+          project: a.project,
+        });
+        break;
+      case 'memory_search':
+        result = await memorySearch({
+          query: a.query,
+          project: a.project,
+          category: a.category,
+          limit: a.limit,
+        });
+        break;
+      case 'memory_list':
+        result = await memoryList({
+          project: a.project,
+          category: a.category,
+          limit: a.limit,
+        });
+        break;
+      case 'memory_context':
+        result = await memoryContext(a.project, a.task_description);
+        break;
+
       default:
         throw new Error(`Unknown tool: ${name}`);
     }