chore: release v2.4.6 with improved npm compatibility and fixes

- fix color detection for cross-platform TTY compatibility
- enhance help command with npm-specific content and npx examples
- remove --install/--uninstall flags pending .claude/ integration testing
- update version across all files and documentation
- preserve implementation code for future release readiness

docs/system-architecture.md

@@ -62,7 +62,7 @@ graph TB
 
 **Key Responsibilities**:
 - Argument parsing and profile detection
-- Special command handling (--version, --help, --install, --uninstall)
+- Special command handling (--version, --help) [--install/--uninstall WIP]
 - Unified process execution through `execClaude()`
 - Error propagation and exit code management