Document disabling local custom animation and climbing assets

docs/custom-content-disabled.md

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+# Local custom content disabled
+
+The current private custom assets are parked under their original directory,
+`assets/private/custom`, with `.disabled` appended to their filenames:
+
+- `crouch-treflip.json.disabled`
+- `climbing.json.disabled`
+- `360flip.json.disabled`
+- `riding.json.disabled`
+
+The animation replacement loader only reads `crouch-treflip.json`; its existing
+missing-file behavior uses stock clips. The climbing loader only reads
+`climbing.json`; without it, both climbing attachment and the approach pose
+overlay return without taking control. The other two files were not referenced
+by the current Rust loaders, but are parked with the rest of the custom content.
+
+No custom-content support code was removed. To reactivate an asset, restore its
+original `.json` filename and restart the game. These private files are ignored
+by Git; this document records the local configuration change. The practice
+block remains ordinary world geometry.