Add building ghost preview

Scripts/verify_building_ghost_preview.py

@@ -0,0 +1,37 @@
+#!/usr/bin/env python3
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+HEADER = ROOT / "Source" / "AgrarianGame" / "AgrarianBuildingPlacementComponent.h"
+SOURCE = ROOT / "Source" / "AgrarianGame" / "AgrarianBuildingPlacementComponent.cpp"
+ROADMAP = ROOT / "AGRARIAN_DEVELOPMENT_ROADMAP.md"
+TECHNICAL_DESIGN = ROOT / "Docs" / "TechnicalDesignDocument.md"
+
+
+def compact(path: Path) -> str:
+    return " ".join(path.read_text(encoding="utf-8").split())
+
+
+def require(path: Path, text: str) -> None:
+    data = compact(path)
+    if text not in data:
+        raise SystemExit(f"FAIL: {path.relative_to(ROOT)} missing required text: {text}")
+
+
+def main() -> None:
+    require(HEADER, "FAgrarianBuildPreviewUpdatedSignature")
+    require(HEADER, "OnBuildPreviewUpdated")
+    require(HEADER, "bShowGhostPreview")
+    require(HEADER, "GetPlacementPreviewState")
+    require(HEADER, "TickComponent")
+    require(SOURCE, "DrawDebugBox")
+    require(SOURCE, "ValidGhostPreviewColor")
+    require(SOURCE, "InvalidGhostPreviewColor")
+    require(SOURCE, "OnBuildPreviewUpdated.Broadcast")
+    require(ROADMAP, "[x] Add ghost preview.")
+    require(TECHNICAL_DESIGN, "green/red wireframe ghost footprint")
+    print("PASS: building ghost preview support is present.")
+
+
+if __name__ == "__main__":
+    main()