Implement syntax: secret move/mv <vault>:<secret> <vault>[:<secret>]
- Copies all versions to destination vault with re-encryption
- Deletes source after successful copy (true move)
- Add --force flag to overwrite existing destination
- Support both within-vault rename and cross-vault move
- Add shell completion for vault:secret syntax
- Include integration tests for cross-vault move
- Rename 'unlockers' command to 'unlocker' for consistency
- Move all unlocker subcommands (list, add, remove) under single 'unlocker' command
- Add --quiet/-q flag to 'secret list' for scripting support
- Update documentation and tests to reflect command changes
The quiet flag outputs only secret names without headers or formatting,
making it ideal for shell script usage like: secret get $(secret list -q | head -1)
