tools.deploy: add deploy tool with pass sync and bulk key management
Adds a deploy wrapper around `clan machines update` that:
- Syncs the password store (pull/push) around deploys
- Extracts the bulk age key into a secure tmpdir for fast decryption
- Cleans up key material on exit
Co-Authored-By: Claude (claude-opus-4-6) <noreply@anthropic.com>