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/routes/parlay.js

@@ -14,8 +14,11 @@
 
 const express = require('express');
 const parlayService = require('../services/parlayService');
+const { createRateLimit } = require('../middleware/rateLimit');
 
 const router = express.Router();
+// Session 32 — public throttle. Parlay math is computation-heavy → 30/min.
+router.use(createRateLimit({ windowMs: 60_000, max: 30 }));
 
 const MISSION_HEADER = { 'X-VYNDR-Mission': 'Catch the legs that fight each other' };