kaffa 11c1ab0134 Add time-aware traffic logger and auto-retrain system ...

- Log traffic features with timestamps to CSV every 5s
- Add hour_sin/hour_cos time features (15 → 17 feature vector)
- Auto-retrain from traffic log at configurable interval (default 24h)
- Detect old 15-feature models and switch to learning mode
- SIGUSR1 now retrains from traffic log first, falls back to collect mode
- Add CLI: `ai traffic` (time-bucketed summary), `ai log` (recent entries)
- Add config keys: traffic_log_file, retention_days, retrain_window

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-07 10:14:07 +09:00

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