Add standalone executable packaging with esbuild + pkg

- Add npm scripts for building Windows/Linux/macOS executables
- Replace uuid package with crypto.randomUUID() for ESM compatibility
- Use esbuild to pre-bundle code before pkg (fixes MCP SDK subpath exports)
- Update CLI name from 'memory' to 'cortex'
- Update USAGE.md with build instructions and standalone setup
- Add bundle/ and build/ to .gitignore

src/mcp/index.ts

@@ -367,6 +367,24 @@ server.tool(
   }
 );
 
+// --- memory_summary ---
+import { getCachedSummary, generateSummary } from '../core/summary';
+
+server.tool(
+  'memory_summary',
+  'Get a pre-computed hierarchical summary of the memory graph. Use this instead of memory_list to reduce context usage.',
+  {
+    refresh: z.boolean().optional().describe('Force regenerate summary (default: use cached)'),
+  },
+  async ({ refresh }) => {
+    let summary = refresh ? null : getCachedSummary();
+    if (!summary) {
+      summary = await generateSummary();
+    }
+    return { content: [{ type: 'text' as const, text: serialize(summary) }] };
+  }
+);
+
 // --- memory_prompt ---
 import { interpretAndExecute } from '../core/prompt/interpreter';