v3: the lake processed + /data page + glossary terms

- scripts/processStatsbomb.ts: one pass over the 17GB StatsBomb lake (4,235
  matches) -> lakestats.json (12.82GB events / 14.9M events / 6,919 players),
  scorestate.json (goal-rate multipliers by game state — shipped as an insight,
  NOT wired into in-play: the raw effect is selection-biased toward stronger
  teams and would distort a calibrated model), fingerprints.json (40/48 nations'
  shots/xG/set-piece share from real event data). Artifacts committed; raw lake
  stays local (gitignored).
- /data page + /api/data/stats: the gigabytes made visible — lake counters,
  historical archive, live-collection counts (odds lines, frozen forecasts,
  enrichment), per-source health with freshness. Footer links.
- Term component: plain-language glossary tooltips (RPS, Brier, ECE, Elo, xG,
  de-vig, ensemble) attached where metrics appear.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

public/data/lakestats.json

@@ -0,0 +1 @@
+{"generatedAt":"2026-06-11T15:35:16.429Z","source":"github.com/statsbomb/open-data","bytes":12824330591,"eventFiles":4235,"matchesParsed":4235,"events":14874171,"players":6919,"competitionSeasons":80,"nationalTeamsCovered":40}