feat(physics): implement Physics2D system (RF4.10)#60
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- PhysicsComponents2D: RigidBody2D, Collider2D (AABB/Circle), PhysicsMaterial presets - PhysicsSystem2D: semi-implicit Euler, spatial grid broad phase, AABB/Circle/mixed narrow phase - Impulse-based resolution with Baumgarte positional correction - Sleep system, one-way platforms, trigger zones - Thread-safe applyForce/applyImpulse (mutex-protected) - Raycast + overlapCircle + overlapAABB spatial queries - OnCollision2D + OnTrigger2D events via EventBus - 2 physics sub-steps per frame for stability - 26 tests covering all major features
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Summary
RigidBody2D,Collider2D(AABB/Circle),PhysicsMaterialpresets (ice, rubber, metal, wood, stone)applyForce/applyImpulse(mutex-protected)OnTrigger2Devent)overlapCircle+overlapAABBspatial queriesOnCollision2D+OnTrigger2Devents via EventBusChanges
src/physics/PhysicsComponents2D.hpp— component typessrc/physics/PhysicsSystem2D.hpp— full header-only system (~745 lines)tests/test_physics2d.cpp— 26 tests covering all featurestests/CMakeLists.txt— addedtest_physics2d.cppsrc/Caffeine.hpp— added physics includesdocs/fase4/physics.md— status ✅, API reference updateddocs/fase4/README.md— status ✅Closes #33