TMCP 0.5.8 makes AIOS_ROOT inert by default. Temporary legacy AIOS adapter execution now requires both TMCP_ENABLE_DEPRECATED_AIOS_ADAPTER=1 and a valid AIOS_ROOT. Standalone TMCP behavior remains unchanged.
This release also makes nested Git runtime fixtures hermetic by removing inherited GIT_* operation state. That prevents parent executors and commit hooks from redirecting fixture commits into a locked or unrelated parent index.
Verification covers disabled-by-default status and explicit dispatch, compatibility activation with both gates, standalone behavior, ambient Git operation isolation, all seven hosted platform jobs on the tag, and deterministic packaging.
Release archive SHA-256: a3d2c17fd77e68a3f892ab31c41d6726aeb4e87cd48cab9ed0f0dc41007bff78