Session 32: Grades pipeline + NFL/NHL wiring + rate limiting + audit cleanup (1718 tests)

- gradeSlateService writes grades:{sport} cache (closes content pipeline →
  dataLevel full); fire-and-forget from oddsService.recordDownstream, gated
  by shouldGradeSlate (off in test, GRADE_SLATE_ON_FETCH override)
- NFL/NHL wired: oddsService SPORT_KEYS/SPORT_MARKETS (correct the-odds-api
  keys americanfootball_nfl/icehockey_nhl), proplineAdapter MARKETS, NHL
  MARKET_MAP keys to avoid silent-zero
- rate limiting mounted on 8 public cached routers (odds/parlay 30/min,
  rest 60/min)
- jsonlLogger writes to temp under test (no more dirtied tracked artifact);
  5MB pipeline test given 20s timeout

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/services/training/jsonlLogger.js

@@ -13,9 +13,18 @@
  */
 
 const fs = require('fs');
+const os = require('os');
 const path = require('path');
 
-const ROOT = path.join(process.cwd(), 'data', 'training');
+// Under test, write to a throwaway temp dir instead of the tracked
+// data/training corpus — otherwise every `npm test` appends resolution rows
+// to data/training/resolutions-YYYY-MM.jsonl and dirties the git tree
+// (Session 31 audit finding; fixed Session 32). `TRAINING_DATA_DIR` lets
+// operators override the location explicitly.
+const ROOT = process.env.TRAINING_DATA_DIR
+  || (process.env.NODE_ENV === 'test'
+    ? path.join(os.tmpdir(), 'vyndr-training-test')
+    : path.join(process.cwd(), 'data', 'training'));
 let initialized = false;
 
 function ensureDir() {