Add support for Bitwarden password manager CLI (bw) with:
- Email/password, API key, and SSO authentication
- tmux session workflow for secure session key management
- Comprehensive reference documentation
- Support for self-hosted Bitwarden/Vaultwarden servers
- Multiple installation methods (npm, brew, choco)
Tested end-to-end on ClawdBot VM:
- Skill loads as clawdbot-managed with correct metadata
- bw CLI installs and authenticates successfully
- Vault operations (list, get username/password) work as documented
- Session key management via BW_SESSION verified
Mirrors the existing 1password skill pattern for consistency.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
