Session 45: Snapshot pipeline + GameCard swap + live ticker (2100 tests)

The on-demand "Read" grade model is RETIRED. A scheduled pipeline pre-grades the
slate, locks grades to the line, tracks movement; the dashboard shows them already
there. Orchestrates existing services — nothing rebuilt.

- snapshotService.runSnapshot(sport): getOdds → gradeAndCacheSlate → classify
  archetype per player → lock gradedAt → line deltas vs previous snapshot → write
  snapshot:{sport}:latest/previous + grades:{sport} → ticker events. Fully
  injectable, zero-network unit tests. runAllSnapshots = cron entrypoint.
- Internal trigger POST /api/internal/snapshot/:sport + /all (requireInternalAuth).
  In-process cron (SNAPSHOT_CRON=1, UTC 14,19,22,1,3) in server.js, no new dep.
- Public reads: GET /api/snapshot/:sport (cache-only) + GET /api/ticker (merges
  TICKER_MANUAL pins) + Next proxies.
- GameCard swap: live Slate renders vyndr/GameCard (legacy kept for types only),
  overlays locked grades onto game props → player name once + archetype badge +
  "Graded Xh ago at -115 · Current 2.5 · ▲ TOWARD +1.0". Ungraded → "Awaiting next
  scan", NO Read button. On-demand onGrade flow deleted.
- Ticker polls /api/ticker every 30s, graceful fallback to hardcoded items.
- NBA/WNBA: espnStatsAdapter free fallback (defensive parse → found:false on shape
  mismatch) wired into resolvePlayerStats after the offline Python service.

Env: PROPLINE_API_KEY_1/2/3, VYNDR_INTERNAL_KEY, SNAPSHOT_CRON=1, TICKER_MANUAL.
Backend 2061 -> 2100 tests (+39), 173 suites. Web build clean (exit 0).

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

src/server.js

@@ -7,6 +7,8 @@ const { getConfiguredProviders, listProviderIds } = require('./config/providers'
 // Session 24 — warm the Tank01 cache after boot so streaks / hot lists /
 // game lines have data on the first page load. Non-blocking; see module.
 const { scheduleStartupPrefetch } = require('./startupPrefetch');
+// Session 45 — in-process snapshot cron (gated on SNAPSHOT_CRON=1).
+const { startSnapshotScheduler } = require('./snapshotScheduler');
 
 // Default 3001 — Next.js owns 3000 locally and in production. The poller,
 // internal cron, and BASE_URL conventions all assume 3001 for the Express
@@ -25,4 +27,7 @@ app.listen(PORT, () => {
   // Session 24 — fire-and-forget cache warm. 5s delay so Redis is ready.
   // Skips itself when RAPID_API_KEY is unset; never blocks or crashes boot.
   scheduleStartupPrefetch();
+
+  // Session 45 — arm the snapshot cron (no-op unless SNAPSHOT_CRON=1).
+  startSnapshotScheduler();
 });