Before killing an agent session, the daemon now verifies that the
agent has set requesting_<action>=true in its state.json file.
This ensures agents have completed pre-shutdown tasks (git clean,
handoff mail, etc) before being terminated.
- Added verifyAgentRequestingState() for state file verification
- Added identityToStateFile() to map identity to state.json path
- Added comprehensive tests in lifecycle_test.go
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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