S9 (a1): slip reader — zero-API OCR

tesseract.js (self-hosted WASM, Apache-2.0) + pure per-book layout
parsers (DK/FD/MGM/Caesars) with per-field confidence and needs_review
honesty — the reader never guesses. POST /api/slips/parse (auth, free
1/day paid 10/day, 4MB cap) + Next proxy. Gated /slip page: upload or
paste, manual-correct UI, per-leg grades through the normal engine
(refusals render honestly), add-all to Parlay Lab, share card. Vision
model upgrade logged post-revenue. 2574 -> 2608 tests.

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

tests/fixtures/slips/fanduel.txt

@@ -0,0 +1,10 @@
+FanDuel Sportsbook
+SAME GAME PARLAY
++650
+Aaron Judge To Record 2+ Total Bases
+Giancarlo Stanton Any Time Home Run
+Gerrit Cole Over 6.5 Strikeouts
+NY Yankees @ BOS Red Sox
+7:05 PM ET
+$10 bet to win $65.00
+Total payout $75.00