Summary

• share scenario spatial index resources across compression, pressure/risk, and motion paths to cut repeated neighbor and barrier lookups
• add barrier-aware spatial indexing in domain systems and trim redundant replay overlay updates in the application layer
• cache static replay overlays so frame playback redraws only the time-varying state

Related Issue

• Closes Task-[Domain] 시뮬레이션 spatial index 공유 및 replay 경량화 #238

Area

• Domain
• Application
• Engine
• Docs
• Build
• Analysis
• Chore

Architecture Check

• I kept the dependency direction application -> domain -> engine.
• I did not add Qt UI code to src/domain.
• I did not add domain or application dependencies to src/engine.
• I used src/ as the include root.

Verification

• cmake --preset windows-debug
• cmake --build --preset build-debug
• ctest --preset test-debug
• Not run (reason below)

Risks / Follow-up

• This PR is stacked on top of [Domain] tune pressure thresholds toward Pathfinder #235 and should be retargeted to main after [Domain] tune pressure thresholds toward Pathfinder #235 merges.
• We should still profile real large scenarios to confirm where the next frame-time bottleneck sits.