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/caesars.txt

@@ -0,0 +1,10 @@
+Caesars Sportsbook
+Bet ID 8823941
+Aaron Judge Total Bases Over 1.5 (-115)
+NY Yankees vs BOS Red Sox
+Pete Alonso Home Runs Over 0.5 (+340)
+NY Mets vs ATL Braves
+Freddie Freeman Hits Under 1.5 (-105)
+LA Dodgers vs SD Padres
+Wager $10.00
+To Win $61.50