Adds a top-level `fabro uninstall` command that reverses `fabro install`
and `install.sh`. Defaults to dry-run (preview) mode, requiring `--yes`
to execute.
Features:
- Inventory and dry-run preview with sizes and `--json` support
- Server shutdown (guarded — only when server is running)
- Safety guardrails (refuses to delete /, $HOME, or dirs without markers)
- Shell config cleanup (exact `# fabro` sentinel match, PATH validation,
atomic write via temp+rename)
- Binary status reporting with tailored brew/cargo/manual hints
- Exit code: 0 on success, 1 on critical failure
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
