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>

src/routes/accuracy.js

@@ -0,0 +1,30 @@
+'use strict';
+
+/**
+ * GET /api/accuracy (Session 55) — the system's track record.
+ *
+ * Public, cache-only read of the rolling accuracy record written by
+ * outcomeService (settled snapshot grades vs real results). Powers the
+ * dashboard "A-rated: 68% hit rate" pill and the grade-card accuracy line.
+ * NEVER triggers settlement (that's the internal cron) → no API credits spent.
+ */
+
+const express = require('express');
+const { createRateLimit } = require('../middleware/rateLimit');
+const outcomeService = require('../services/outcomeService');
+
+const router = express.Router();
+router.use(createRateLimit({ windowMs: 60_000, max: 60 }));
+
+router.get('/', async (req, res) => {
+  try {
+    const acc = await outcomeService.getAccuracy();
+    res.set('Cache-Control', 'public, max-age=300');
+    return res.json(acc);
+  } catch (err) {
+    console.error('[accuracy]', err.message);
+    return res.status(200).json({ overall: null, sports: {}, min_sample: outcomeService.MIN_SAMPLE, updated_at: null });
+  }
+});
+
+module.exports = router;