feat(dev): add an update lab for multi-environment update testing

Provider latest-version checks honour npm_config_registry, and t3 update reads the release index from T3CODE_RELEASE_BASE_URL when set, so the lab (and npm or release mirrors) can serve both.
9d6b5ea2b6maria-rcks committed on 10/9/2026, 6:31:09 PMparenta669827
4 files changedLine totals unavailable