Session E (night2): Phase 4 — scan + parlay polish

4.1 ROOT CAUSE of 'Ohtani returns nothing': no backend
    /api/players/search existed (MLB 404'd; NBA/WNBA hit the offline
    Python service). New Express route + mlbStatsAdapter.matchPlayers —
    canonical nameKey fuzzy match (exact > last-name prefix > folded
    substring). LIVE-VERIFIED vs the real 1,299-player list: Ohtani /
    Aaron Judge / Sánchez / sanchez / Chisholm Jr all resolve; accented
    and unaccented return identical results. Non-MLB matches the
    platform's cached names (rosterlogs + grades), cache-only.
4.2 Reveal choreography per §7: analyzing steps → DECLASSIFIED stamp →
    90ms-staggered context panels (entrance floors visible per the
    Phase-0 rule); prefers-reduced-motion skips straight to the card.
4.3 PRIOR READS chips on scan results — the model's public ledger
    history for the player (deferred-render, outcomes + pending, never
    invented). /api/ledger/model gains ?player= on entries.
4.4 Parlay Lab: humanized stat labels via the ONE shared formatter
    (lib/gradeAdapter.statLabel); 1-leg provisional grade ('Leg grade:
    B — add a leg for the combined read'); discoverable entry — Nav
    'Parlay Lab' item opens the drawer via window.__openParlay, and the
    open drawer now renders an honest empty state at 0 legs.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/unit/mlbStatsAdapter.test.js

@@ -176,3 +176,26 @@ describe('searchPlayer — canonical nameKey resolution', () => {
     expect(hit).toBeNull();
   });
 });
+
+// Session 60 (night2/E, audit 4.1) — the scan box fuzzy matcher.
+describe('matchPlayers — fuzzy search (pure)', () => {
+  const LIST = [
+    { id: 1, fullName: 'Shohei Ohtani', currentTeam: { name: 'Los Angeles Dodgers' }, primaryPosition: { abbreviation: 'DH' } },
+    { id: 2, fullName: 'Aaron Judge', currentTeam: { name: 'New York Yankees' }, primaryPosition: { abbreviation: 'RF' } },
+    { id: 3, fullName: 'Cristopher Sanchez', currentTeam: { name: 'Philadelphia Phillies' }, primaryPosition: { abbreviation: 'P' } },
+    { id: 4, fullName: 'Jazz Chisholm Jr.', currentTeam: { name: 'New York Yankees' }, primaryPosition: { abbreviation: '3B' } },
+  ];
+  const { matchPlayers } = adapter;
+
+  test.each([
+    ['ohtani', 1], ['Aaron Judge', 2], ['Sánchez', 3], ['sanchez', 3], ['Chisholm Jr', 4], ['jazz chisholm', 4],
+  ])('"%s" resolves', (q, id) => {
+    const hits = matchPlayers(LIST, q);
+    expect(hits.length).toBeGreaterThan(0);
+    expect(hits[0].id).toBe(id);
+  });
+
+  test('sub-2-char garbage resolves nothing', () => {
+    expect(matchPlayers(LIST, '')).toEqual([]);
+  });
+});