* fix(witness): detect and ignore stale POLECAT_DONE messages
Add timestamp validation to prevent witness from nuking newly spawned
polecat sessions when processing stale POLECAT_DONE messages from
previous sessions.
- Add isStalePolecatDone() to compare message timestamp vs session created time
- If message timestamp < session created time, message is stale and ignored
- Add unit tests for timestamp parsing and stale detection logic
Fixes#909
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
* feat(mail): add --stale flag to gt mail archive
Add ability to archive stale messages (sent before current session started).
This prevents old messages from cycling forever in patrol inbox.
Changes:
- Add --stale and --dry-run flags to gt mail archive
- Move stale detection helpers to internal/session/stale.go for reuse
- Add ParseAddress to parse mail addresses into AgentIdentity
- Add SessionCreatedAt to get tmux session start time
Usage:
gt mail archive --stale # Archive all stale messages
gt mail archive --stale --dry-run # Preview what would be archived
Co-Authored-By: GPT-5.2 Codex <noreply@openai.com>
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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: GPT-5.2 Codex <noreply@openai.com>
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