Completes P0-3 across all three surfaces:
- CONSENSUS VS MODEL (MarketBreadth): dedupe by player+market so Ben Williamson's
alt-line variants show as ONE consensus row (no per-market cap — a consensus
table just shouldn't repeat a player).
- LEDGER cards: group by player+market via groupIntoLadders — Alec Bohm's
strikeout ladder (U1.6/U1.3/O1.5) is now ONE card with the rungs nested (each
its own side/line + tier-colored grade), not three separate cards.
- playerGrouping reads player OR player_name (ledger rows use player_name) —
regression-tested so the ledger doesn't silently empty.
The Alt Line Ladder shape is what /pricing already demos; the record now uses it.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Phone audit: leaderboard flooded with 9 consecutive identical 'stolen_bases U0.5
45% B' rows. New shared lib/playerGrouping (dedupeLeaders + groupIntoLadders,
name-key aware, 7 unit tests): ONE row per (player, market family) keeping the
best-ranked, then a per-market cap (4) so no single prop type floods the board.
Applied to ExploreHub. Ledger cards + Consensus grouping follow in P0-3b/c using
the same lib.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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