Build on the play, not the screenshot

OpenPlay Football Demo Schema v0.1 describes players, coordinates, assignments, decision points, and narratives as data. This implementation uses that idea to drive diagrams, animation, simulation, and coaching copy from the same play records.

• src/lib/offense.ts and src/lib/defense.ts are the canonical play records.
• src/lib/field.ts turns formations and assignments into coordinates.
• src/lib/simulation.ts scores matchups and decision quality with a deterministic fallback.
• src/lib/challenges.ts is the first Challenge Lab catalog — 45 situations.