Release the 28 CHANGELOG-selected distributions with Core and the root meta-package at 1.26.0, GitHub Copilot at 2.2.0, and changed prereleases stamped 261112. Refresh the Core standard-install cohort and raise Core floors only for AG-UI, GitHub Copilot, OpenAI, and Redis where the new Core behavior is required. Include compatible SDK and development dependency updates, retain the AG-UI Protocol, Redis, and ty compatibility limits, and apply the approved minimal lint and SDK-regression-test cleanups. No cohort-wide prerelease bump is applied. The standalone Lab workspace remains outside the release batch, and Cosmos Memory needs no version bump because its only change removes a stale lint suppression.