feat: ATR-GridBot mit Regime-Filter — Walk-Forward, Gate nicht bestanden

3 fixe Varianten (spacing 1.0/1.5×ATR, ADX<20/15): OOS-PF 0.87/1.03/0.94.
Grid-Stops bei Range-Breakdowns fressen die TP-Gewinne — kein Paper-Deploy.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

package.json

@@ -8,6 +8,7 @@
     "backfill": "bun run src/server/scripts/backfill.ts",
     "walkforward": "bun run src/server/scripts/walkforward.ts",
     "rotation": "bun run src/server/scripts/rotation-walkforward.ts",
+    "grid": "bun run src/server/scripts/grid-walkforward.ts",
     "db:generate": "bunx drizzle-kit generate",
     "db:migrate": "bun run src/server/db/migrate.ts"
   },