Session 55: Self-learning loop + real-time layer (2274 tests)

Product overhaul core — the two transformative, differentiated systems:

Self-learning loop (Phase 2): outcomeService settles locked snapshot grades
against real MLB Stats API results → hit/miss/push, rolling accuracy by grade
tier (30d window). Idempotent, injectable, unit-tested. New GET /api/accuracy +
/api/ledger/accuracy + internal settle triggers + cron hook. AccuracyBadge
(dashboard/scan/landing) is honest — "LEARNING" below MIN_SAMPLE, never a fake
number. Settled HIT/MISS chips overlay the live slate.

Real-time layer (Phase 1): Slate silent 60s auto-refresh (no flash, no wipe on
transient blips) + "SIGNAL LIVE · UPDATED Xs ago" freshness strip; Ticker LIVE
badge that flashes on fresh events.

Landing (Phase 3): TopSignals shows tonight's real top-3 A-rated grades + live
accuracy — the product shown, not described.

Founder pricing: FOUNDER_CODE_EXPIRY default 2026-06-30 → 2026-12-31 (had
lapsed, disabling every founder code + the ClaimMeter pitch). That expiry — not
a tier change — was the real cause of the 4 stripe test failures.

Backend 2255 (4 failing) → 2274 (all green; +19 new, +4 fixed). Web build exit 0.

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

web/src/app/scan/page.tsx

@@ -3,6 +3,7 @@
 import { useCallback, useEffect, useMemo, useState } from 'react';
 import { useRouter } from 'next/navigation';
 import ProcessingGrade from '@/components/vyndr/ProcessingGrade';
+import { AccuracyBadge } from '@/components/vyndr';
 import type { GradeResultData } from '@/components/vyndr/GradeResultCard';
 import { mapScanToGradeResult } from '@/lib/gradeAdapter';
 import { normalizeName, nameKey } from '@/lib/playerName';
@@ -736,6 +737,12 @@ export default function ScanPage() {
             onReadAnother={reset}
           />
 
+          {/* Session 55 — the self-learning loop's track record for this sport.
+              "The system learns" — real hit rate on graded props, misses shown. */}
+          <div style={{ display: 'flex', justifyContent: 'center' }}>
+            <AccuracyBadge variant="chip" sport={sport?.toLowerCase()} />
+          </div>
+
           {/* Sportsbook hand-off (preserved feature) */}
           <div style={{ display: 'flex', flexWrap: 'wrap', gap: 8, justifyContent: 'center' }}>
             {SPORTSBOOKS.map((b) => (