Three fixes to make dog dispatch work end-to-end:
1. Add BuildDogStartupCommand in loader.go
- Similar to BuildPolecatStartupCommand/BuildCrewStartupCommand
- Passes AgentName to AgentEnv so BD_ACTOR is exported in startup command
2. Use BuildDogStartupCommand in dog.go
- Removes ineffective SetEnvironment calls (env vars set after shell starts
don't propagate to already-running processes)
3. Add "dog" case in mail_identity.go detectSenderFromRole
- Dogs now use BD_ACTOR for mail identity
- Without this, dogs fell through to "overseer" and couldn't find their mail
Tested: dog alpha now correctly sees inbox as deacon/dogs/alpha
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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