Tools like tombi that validate pyproject.toml against SchemaStore schemas in strict mode reject valid [tool.tox] keys such as env_list, requires, env, and env_run_base. 🔍 The root cause is that SchemaStore's partial-tox.json wrapper references tox.json via allOf but lacks explicit additionalProperties: true, and tombi's strict mode treats missing additionalProperties as false.

The release workflow now generates and pushes partial-tox.json alongside tox.json to SchemaStore, ensuring the partial schema always includes additionalProperties: true. A tombi.toml configures local schema validation against the repo's own tox.schema.json, so both tox.toml and pyproject.toml with [tool.tox] sections are validated with tombi lint using the local schema rather than depending on SchemaStore being correct.

Fixes #3823