Session 44: Make it visible — VYNDR archetype names, grade intel, schedule fix, landing page (2061 tests)

Frontend + wiring only. Wires existing backend into the pages users see.

- VYNDR Original archetype rename (41) across archetypeService.js + lib/
  archetypes.js + ArchetypeBadge, each keeping legacyName (resolves stale data).
  Judge -> BOMBER. Old POWER PULL slot -> WHIFF strikeout-artist pitcher.
- BACKEND_HANDOFF.md: canonical frontend<->backend data contract.
- Grade card intel: scan/page.tsx now forwards the engine's intel fields
  (season_avg/form/usage/matchup_grade/archetype/...) into mapScanToGradeResult
  -> STAT CONTEXT + VYNDR INTELLIGENCE sections populate. The chain already
  preserved them (tierGating + /api/scan spread); the page was dropping them.
- Schedule freshness: slateAdapter.isRelevantGame drops completed games >24h
  old; Slate.filteredGames applies it. (TTL already 60s.)
- Landing: Features.tsx rewritten to user-facing copy (no Point-biserial/Zone
  14/ABS/Phi-coefficient).
- Depth chart Next proxies added (/api/stats/lineup|depth|cascade) - were 404.
- GameCard swap DEFERRED (Kev): legacy on-demand card stays as a bridge until
  the snapshot pipeline populates the grades cache; vyndr/GameCard swaps in then.

Backend 2045 -> 2061 tests (+16), 167 suites. Web build clean (exit 0).

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

web/src/lib/slateAdapter.js

@@ -175,6 +175,23 @@ function mapPitchers(game) {
   };
 }
 
+/**
+ * Should this game still show on the slate (Session 44)? Upcoming + live games
+ * always show; a COMPLETED game is dropped once it's more than 24h old, so a
+ * 5-day-old FINAL never lingers on the dashboard. Unknown/missing date → keep
+ * (degrade open). `now` is injectable for tests.
+ */
+function isRelevantGame(game, now = Date.now()) {
+  if (!game) return false;
+  const state = String(game.state || game.status || '').toLowerCase();
+  const isFinal = state === 'final' || state === 'post' || state === 'closed' || state === 'complete';
+  if (!isFinal) return true;
+  const raw = game.date || game.gameTime || game.commence_time || game.startTime;
+  const t = raw ? new Date(raw).getTime() : NaN;
+  if (Number.isNaN(t)) return true; // no parseable date → don't hide
+  return (now - t) / 3_600_000 < 24;
+}
+
 module.exports = {
   parseAmericanOdds,
   detectBestLines,
@@ -183,4 +200,5 @@ module.exports = {
   formatGameTime,
   groupPropsByPlayer,
   mapPitchers,
+  isRelevantGame,
 };