- HookEvent struct parses Claude Code hook JSON payload
- processHookEvent maps Notification/Stop/PostToolUse/PreToolUse to State+WaitType
- UpdateFromHook creates new entries and manages WaitingSince transitions
- SessionInfo.WaitType serialized in JSON with omitempty
- 12 tests cover all event mappings, edge cases, and JSON serialization
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>