Upload docs/primitive_collision_proxy_spec.md with huggingface_hub

docs/primitive_collision_proxy_spec.md

@@ -127,10 +127,15 @@ The script currently parses OBJ geometry directly. Use OBJ input for this tool.
 | Option | Default | Meaning |
 | --- | --- | --- |
 | `--variant <name>` | `primitive_boxes_v1` | Output suffix. The derived asset directory becomes `<source_asset_id>_<variant>`. |
-| `--output-dir <path>` | canonical derived path | Optional explicit output directory for inspection. |
+| `--output-dir <path>` | canonical derived path | Optional explicit output directory for inspection. Do not use with `--register-manifest`. |
 | `--overwrite` | false | Allow writing into an existing output directory. Use cautiously. |
 | `--register-manifest` | false | Append the generated derived asset to `manifest/assets.jsonl`. Use only for outputs intended to be kept. |
 
+Compatibility rule:
+
+- Registered assets must use the canonical path under `assets/<source>/derived/primitive_collision_proxies/<category>/<asset_id>/`.
+- `--output-dir` is for temporary inspection only and is rejected when combined with `--register-manifest`.
+
 ### Proxy generation options
 
 | Option | Default | Meaning |