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Capture the periodic upgrade of the four nixpkgs channels and home-manager as a repo doc: check for a NixOS stable bump first, rebase the devplayer0 fork against upstream (re-verifying the patch stack against freshly fetched refs), run the update commands, sweep version-gated TODOs, and review the remaining flake inputs. Keep the canonical, agent-agnostic procedure in docs/ and point both AGENTS.md and a thin Claude Code skill at it. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>