chore: complete TypeScript migration (Phase 05-06)

Phase 05: Migrate test imports from bin/ to dist/
- Update 19 test files to import from dist/ instead of bin/
- Update CLI path in cli.test.js and special-commands.test.js
- Update cross-platform.test.js to check dist/ directory

Phase 06: Cleanup & validation
- Remove bin/ directory (32 JS files)
- Fix ClaudeSymlinkManager import in doctor.ts
- Update postinstall.js to use dist/ modules
- Regenerate package-lock.json (now points to dist/ccs.js)

All 39 tests passing. TypeScript migration complete.

tests/npm/cli.test.js

@@ -5,7 +5,7 @@ const fs = require('fs');
 const os = require('os');
 
 describe('npm CLI', () => {
-  const ccsPath = path.join(__dirname, '..', '..', 'bin', 'ccs.js');
+  const ccsPath = path.join(__dirname, '..', '..', 'dist', 'ccs.js');
   const ccsDir = path.join(os.homedir(), '.ccs');
   const configPath = path.join(ccsDir, 'config.json');