WinRacing V52.6 Chairman Memory Engine

- Added persistent advisory memory sourced from V52 JSON snapshots.
- Aggregates Pattern, Race DNA and FP/FN root-cause memories.
- Added memory strength, recency, sample weight, sentiment and recommendation.
- No database schema changes.
- No V44-V51 score or decision changes.
- Live weights remain unchanged; ADVISORY_ONLY.
