0ad1b30941
Implements core startup infrastructure: - AppConfig for data directory paths - ensure_data_dir() to create ~/.local/share/mc/ - verify_cli_dependencies() async CLI availability check - load_with_migration() for state file loading with migration support - init() main entry point coordinating lock acquisition and setup - StartupWarning enum for non-fatal issues (missing CLIs, state reset) - InitError enum with conversion to McError Also exposes Bridge::with_data_dir() publicly (was test-only). Includes 11 tests covering directory creation, lock acquisition, lock contention, corrupt file handling, and config paths. bd-3jh Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
