[Nauxie]

Summary

• expand the authored archipelago, traversal route, landmarks, collision coverage, and streaming behavior
• make mouse camera response immediate while enforcing measured translation/rotation continuity across normal play, resets, collisions, and frame hitches
• optimize the default development profile and add fail-closed camera, world-content, and debug-performance regression gates
• update README, status, evaluation, and flight-mechanics documentation to match the validated baseline

Verification

• cargo fmt --check
• cargo check --all-targets
• cargo clippy --all-targets --all-features -- -D warnings
• cargo test --all-targets --quiet
• ./tools/camera_continuity_gate.sh target/eval/camera-continuity/pre-merge-final-3
• ./tools/world_content_gate.sh target/world_content_gate/pre-merge-final-3
• ./tools/dev_play_performance_gate.sh target/eval/dev-play-performance/pre-merge-final

Debug/release performance gate: 16.57 ms / 16.67 ms average frame time, with zero frames over 33.34 ms.