Recovered from reflog - these commits were lost during a rebase/force-push.
Dogs are directories with state files but no sessions. When `gt dog dispatch`
assigned work and sent mail, nothing executed because no session existed.
Changes:
1. Spawn tmux session after dispatch (gt-<town>-deacon-<dogname>)
2. Set BD_ACTOR=deacon/dogs/<name> so dogs can find their mail
3. Add dog case to AgentEnv for proper identity
Session spawn is non-blocking - if it fails, mail was sent and human can
manually start the session.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2590e3de3b