feat: implement Part D and E from FIXPLAN

- D1/D2/D2c: Added TraderTraits entity, TraderTraitCalculator, Market Return Metrics (MedianWin, AvgWin, etc.), and trait filters
- D3: Implemented HF-Trader Tiering via IngestMode (Full, Aggregated, SnapshotOnly) and updated TradeHistoryWorker to respect tiers
- E1-E5: Added MasterStatus to Trader, TraderWindowMetrics for rolling analytics, Fingerprint metrics (PriceBandProfile, P50/P90), Copyability aggregates (Volume, Drift, Edge)
- E6: Implemented GET /api/traders/{id}/profile and GET /api/traders/correlation
- Replaced FIXPLAN-2026-07-09.md with FIXPLAN-TODO.md and FIXPLAN-DONE.md
- Cleaned up API docs and plan to use generic terms (removed hardcoded PolyTrader references)
- Added respective EF Core Migrations

src/Predictalytics.Infrastructure/Data/Repositories/TraderRepository.cs

@@ -17,6 +17,7 @@ public class TraderRepository : ITraderRepository
             .Include(t => t.CurrentScore)
             .Include(t => t.Analytics)
             .Include(t => t.CategoryPerformances)
+            .Include(t => t.Traits)
             .FirstOrDefaultAsync(t => t.Id == id, ct);
     }
 
@@ -29,6 +30,7 @@ public class TraderRepository : ITraderRepository
         var q = _db.Traders
             .Include(t => t.CurrentScore)
             .Include(t => t.Analytics)
+            .Include(t => t.Traits)
             .AsQueryable();
 
         if (platform.HasValue) q = q.Where(t => t.Platform == platform.Value);