WC2026 match-detail intelligence endpoint (lineups, shots+xG, momentum, etc.)

Match meta + Elo prediction + odds + every ingested detail section. Sections are null when that section has not been ingested for this match yet, or came back empty. 60s cache. Every player_id, team_id and match_id inside the sections (lineups, player_match_stats, team_match_stats, best_players, avg_positions, pre_match_form, momentum) is a Big Balls UUID. The recent_match_history and ranked_form_metrics sections are also served: recent_match_history contains each side's recent finished-match sequence, ranked_form_metrics contains each side's ranked, form-derived indicators, and pre_match_form remains the v1 compatibility alias (ranked metrics when present, otherwise recent-match history); their ids are Big Balls UUIDs too. A player_id is null when the player is not yet linked to a player record; player_name is still populated on lineups. Legacy alias: GET /v1/nerd/wc2026/matches/{id} (sunset 2026-09-01).

elo_prediction carries its own freshness: valid_until, expired (true / false / null when no expiry is stated) and expired_days. Measured 2026-09-28, all 72 match_result predictions are past their valid_until, the newest by 92 days, and these routes previously carried no expiry at all; so the block read as a forecast for a match already played. Nothing is filtered; the block is disclosed, not withheld.