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/shared/unit/helpers.test.js

@@ -1,7 +1,7 @@
 const assert = require('assert');
 const path = require('path');
 const os = require('os');
-const { expandPath } = require('../../../bin/utils/helpers');
+const { expandPath } = require('../../../dist/utils/helpers');
 
 describe('helpers', () => {
   describe('expandPath', () => {