BookComparison.tsx was built but UNROUTED (dead). Route it to the GradeResultCard
via a new self-fetching BookComparisonPanel that reads the live /api/books feed
(source:'bookprices' — the snapshot-locked, fenced, byte-identical store).
Contract fix (Review Zero 0.1): books frequently sit at DIFFERENT lines (WNBA DK
21.5 / FD 18.5; MLB 2/3), so BookComparison now renders EACH book's own line
per-row — never one shared header line implying a false same-number comparison.
Honest states: single-book (the common case for MLB) → one book, "One book
posting this prop.", NO crown/second row; multi-book → all books' own line+price,
NONE crowned (BOOK_CROWN_ENABLED=false — no best-price claim, verified live
crowned:false); no books → renders NULL (panel self-hides), never a placeholder.
No regression: only the always-empty inline d.books section was replaced; grade,
projection, PropLine line, and PriceTriplet price are untouched (wiring test
asserts them). Freshness (0.4): bookprices is written in the SAME snapshot that
locks the grade (intraday refresh touches neither gradedAt.line nor bookprices) —
same fresh, no stale-label needed. Web-only → grade byte-identical trivially.
Full suite 3851 green, web build exit 0.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VsztNChZ7vEvSR61AuMhD1
