Implement lifecycle hooks for cleanup command

[Stephanvs]

As described in the documentation, the cleanup command should run pre_cleanup and post_cleanup lifecycle hooks if configured.

Current behavior: No hooks are executed during cleanup.

Implementation needed:

• Inject ScriptsConfig and HookRunner into CleanupCommand
• Run PreCleanup hook before removing worktrees
• Run PostCleanup hook after removing worktrees
• Handle hook failures appropriately (log but don't block cleanup)