Backend-neutral physics adapter contracts for Agent Engine experiments.
Until 2026-09-26 this record combined several servers published from one repository. The others now have records of their own: @game_engine/core, @game_engine/scene, @game_engine/runtime-headless, @game_engine/testkit, @game_engine/import-ldtk, @game_engine/contracts, @game_engine/editor-adapter, @game_engine/runtime-browser-pixi, @game_engine/physics-planck, @game_engine/import-tiled, @game_engine/cli, @game_engine/mcp-server, @game_engine/physics-rapier. Checks from before that date include them.
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