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/cli/index.ts

@@ -16,8 +16,8 @@ import { closeDb } from '../core/db';
 const program = new Command();
 
 program
-  .name('memory')
-  .description('Cortex — AI project memory & knowledge graph')
+  .name('cortex')
+  .description('Cortex — AI project memory & knowledge graph\n\nStore, link, and search project knowledge as a graph of typed nodes.')
   .version('1.0.0');
 
 program.addCommand(addCommand);