Add actor content scenario validation

docs/testing.md

@@ -196,3 +196,17 @@ This validator checks real cross-pack world references:
 - each selected `Outdoor*` map pack contains `mapproperty.txt`
 - `TextureSet` targets from `setting.txt` exist in `textureset`
 - `Environment` targets from `setting.txt` exist in `ETC/ymir work/environment`
+
+Actor/content scenario validator:
+
+```bash
+python3 scripts/validate_actor_scenarios.py \
+  --runtime-root /tmp/m2dev-client-runtime-http \
+  --json
+```
+
+This validator checks local actor integrity for `Monster`, `NPC`, and `PC`:
+
+- `motlist.txt` motion files exist
+- each motion has a paired `.gr2` in the same actor directory
+- `.msm` base model targets resolve against the runtime asset set