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/draftkings.txt

@@ -0,0 +1,20 @@
+DraftKings Sportsbook
+3 Leg Parlay
++575
+Aaron Judge Over 1.5
+Total Bases
+-115
+NY Yankees @ BOS Red Sox
+Today 7:05PM
+Shohei Ohtani Over 7.5
+Strikeouts Thrown
+-130
+LA Dodgers @ SD Padres
+Today 9:40PM
+Juan Soto Over 0.5
+Home Runs
++320
+NY Mets @ ATL Braves
+Today 7:20PM
+Wager: $10.00
+To Win: $57.50