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/utils/oddsNormalizer.js

@@ -71,6 +71,13 @@ const MARKET_MAP = {
   player_goals_conceded: 'goals_conceded',
   player_passes: 'passes',
   team_clean_sheet: 'clean_sheet',
+
+  // NHL (Session 32) — added alongside the NFL/NHL sport-key wiring so NHL
+  // props don't silently normalize to zero in-season (same silent-failure
+  // class as the NFL gap Session 31 closed). player_goals/player_assists
+  // are shared with soccer/NBA — sport context discriminates downstream.
+  player_shots_on_goal: 'shots_on_goal',
+  goalie_saves: 'saves',
 };
 
 function normalizeProps(eventsWithOdds) {