Enable CCD for lander sky collisions and remove manual ceiling clamp

[chungwu]

Motivation

• Landers could tunnel past the sky ceiling in a single physics step and end up above world bounds, preventing correct bounce behavior.
• The previous fix clamped landers to the ceiling in enforceSkyBoundary, which bypassed the physics engine and prevented normal restitution/spring response.
• Using continuous collision detection (CCD) lets the physics engine detect fast collisions and apply restitution naturally.

Description

• Enabled CCD on the lander rigid body by calling .setCcdEnabled(true) in Lander.create so Rapier will detect high-speed collisions with the sky collider.
• Removed the manual ceiling clamp by deleting the enforceSkyBoundary call and implementation from game/game-state.ts so the engine’s collision response handles bounces.
• Cleaned up imports in game/game-state.ts by removing the unused Vector2 import.

Testing

• No automated tests were run for this change.

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Codex Task

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Project	Deployment	Review	Updated (UTC)
combat-lander	Ready	Preview, Comment	Jan 6, 2026 4:59am