chore(01-01): initialize TypeScript project with ESM

- Configure package.json with type: module, ESM-compatible setup
- Add dependencies: commander, execa
- Add devDependencies: typescript, tsx, rimraf, @types/node
- Configure tsconfig.json for ES2022/NodeNext
- Add .gitignore with node_modules and dist
- Create src/index.ts and src/bin/cw.ts placeholders

src/bin/cw.ts

@@ -0,0 +1,8 @@
+#!/usr/bin/env node
+/**
+ * Codewalk District CLI Entry Point
+ */
+
+import { VERSION } from '../index.js';
+
+console.log(`cw cli v${VERSION}`);

src/index.ts

@@ -0,0 +1,10 @@
+/**
+ * Codewalk District - Library Entry Point
+ *
+ * Multi-agent workspace for orchestrating multiple Claude Code agents.
+ */
+
+export const VERSION = '0.0.1';
+
+// Placeholder for future module exports
+export {};