Tilemap stuff

.claude/style.md

@@ -227,6 +227,27 @@ errorret_t spriteBatchFlush(void);
 
 ---
 
+## Unused parameters
+
+Do **not** use `(void)param;` casts to suppress unused-parameter warnings. They are
+redundant noise. If a callback signature is fixed by a function-pointer type and the
+parameter is genuinely unused, just leave it — do not suppress:
+
+```c
+// correct — parameter unused, no cast
+errorret_t sceneTestUpdate(scenedata_t *data) {
+  errorOk();
+}
+
+// wrong
+errorret_t sceneTestUpdate(scenedata_t *data) {
+  (void)data;
+  errorOk();
+}
+```
+
+---
+
 ## Global subsystem state
 
 Each subsystem exposes a single global instance declared `extern` in the header and defined (once) in the `.c` file: