Adds first-class support for the human overseer in Gas Town mail:
- New OverseerConfig in internal/config/overseer.go with identity
detection (git config, gh cli, environment)
- Overseer detected/saved on town install (mayor/overseer.json)
- Simplified detectSender(): GT_ROLE set = agent, else = overseer
- New overseer address alongside mayor/ and deacon/
- Added --cc flag to mail send for CC recipients
- Inbox now includes CC'd messages via label query
- gt status shows overseer identity and unread mail count
- New gt whoami command shows current mail identity
Generated with Claude Code
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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