fix(UC-02): LOW review items — anchored path strip + corner offset doc

- Use substring instead of replace for path cleanup (anchored, no double-strip risk)
- Document that corner_decorations ignores x/z offsets (by design)

src/main/java/com/tiedup/remake/worldgen/HangingCagePiece.java

@@ -637,6 +637,8 @@ public class HangingCagePiece extends StructurePiece {
         int[][] corners = layout.innerCorners();
 
         // Corner decorations (e.g. cobwebs low+high, soul fire, snow layers)
+        // Note: only y_offset is used here — x/z offsets are ignored because corners
+        // are placed at all 4 inner corners and direction logic would differ per corner.
         for (DecorationConfig.PositionedBlock pb : deco.cornerDecorations()) {
             for (int[] c : corners) {
                 if (layout.isInShape(c[0], c[1]) && !layout.isWall(c[0], c[1])) {

src/main/java/com/tiedup/remake/worldgen/RoomThemeReloadListener.java

@@ -60,9 +60,11 @@ public class RoomThemeReloadListener
             Resource resource = entry.getValue();
 
             // Derive clean ID from file path: "tiedup:tiedup_room_themes/oubliette.json" -> "tiedup:oubliette"
-            String cleanPath = fileId.getPath()
-                .replace(DIRECTORY + "/", "")
-                .replace(".json", "");
+            String rawPath = fileId.getPath();
+            String cleanPath = rawPath.substring(rawPath.indexOf(DIRECTORY + "/") + DIRECTORY.length() + 1);
+            if (cleanPath.endsWith(".json")) {
+                cleanPath = cleanPath.substring(0, cleanPath.length() - 5);
+            }
             ResourceLocation cleanId = new ResourceLocation(fileId.getNamespace(), cleanPath);
 
             try (InputStream input = resource.open()) {