[Domain] Propagate stalled state through queues

[muzygosu]

Summary

• 기존 stalled판정에서 이상하다고 느낀점은 앞뒤의 유닛이 stalled일때 그 사이 유닛이 stalled 상태가 아닐때가 있습니다.
  즉, 가운데 유닛이 이동할공간이 조금있다는 의미이고, 뒤에있는 유닛의 stalled가 곧 풀린다는 의미입니다.

앞,뒤 유닛이 stalled상태일때 그 사이 유닛이 stalled여야 자연스럽다는 의미입니다.
그래서 stalled판정에 앞뒤 유닛이 stalled일때 그 사이의 유닛도 stalled가 되도록 변경하였습니다.

• Propagate the displayed stalled state to a moving agent when it is between stalled neighbors on the same floor and lane.
• Apply the same post-processing to live simulation frames and T90/T95 keyframes so replay/result visuals stay consistent.
• Add regression coverage for queue propagation and for avoiding false propagation from a side lane.

Area

• Engine
• Domain
• Application
• 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-no-app
• cmake --build --preset build-no-app-debug --target safecrowd_tests
• ctest --preset test-no-app-debug --output-on-failure
• cmake --build --preset build-debug --target safecrowd_app
• git diff --check
• cmake --preset windows-debug
• cmake --build --preset build-debug
• ctest --preset test-debug
• Not run (reason below)

Risks / Follow-up

• This changes the displayed/result-frame stalled state only; it does not alter movement, pressure, density, bottleneck, or cross-flow physics.
• The existing MSVC C4819 encoding warning in src/engine/ComponentRegistry.h still appears during builds and is unrelated to this change.