Item 7 — book roster: ESPN BET → theScore Bet (PENN)

ESPN BET is defunct — PENN/ESPN terminated the deal; PENN rebranded it to
theScore Bet (Dec 1 2025) and ESPN is now exclusive with DraftKings. Removed
the ESPN BET entries from the BookChip map (web/src/lib/books.js) and added
theScore Bet (mono TS, slug thescore) as the successor. Added 'thescore' to the
backend oddsNormalizer ALLOWED_BOOKS so the feed's lines are accepted; synced
the bookWordmark test list. The ESPN references in src/config/sports.js are
ESPN's STATS API (data provider, unrelated to the sportsbook) — left untouched.

Flagged in specs/design-reference/HANDOFF.md that the design mockups' BookChip
row still shows ESPN BET and needs the same one-swap on the next refresh.

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

src/utils/oddsNormalizer.js

@@ -5,7 +5,8 @@ const { getAbbreviation } = require('./teamMap');
 // prop data through Pinnacle survives normalization. (bovada deliberately
 // left OUT — it's the canonical "not-allowed" example in the tests, and
 // VYNDR surfaces regulated US books.)
-const ALLOWED_BOOKS = new Set(['draftkings', 'fanduel', 'betmgm', 'caesars', 'fanatics', 'bet365', 'hardrockbet', 'pointsbet', 'betrivers', 'pinnacle']);
+// 'thescore' = theScore Bet (PENN), successor to the defunct ESPN BET (item 7).
+const ALLOWED_BOOKS = new Set(['draftkings', 'fanduel', 'betmgm', 'caesars', 'fanatics', 'bet365', 'hardrockbet', 'pointsbet', 'betrivers', 'pinnacle', 'thescore']);
 
 const MARKET_MAP = {
   // NBA / WNBA props