Implements dog management commands:
- gt dog add <name>: Create dog in kennel with multi-rig worktrees
- gt dog remove <name>: Retire dog, cleanup worktrees
- gt dog list: Show the pack with status
- gt dog call [name]: Wake idle dog(s)
- gt dog status [name]: Show detailed dog state
Dogs are reusable workers managed by the Deacon for infrastructure tasks.
Each dog gets worktrees into all configured rigs (gastown, beads, etc.).
Includes internal/dog package with Manager and state handling (from gt-0x5og.2).
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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