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ci.yml: main's NixOS-runner rewrite, with this branch's --ci build and --ci kb steps. Main's separate `checkers.sh kb` step is dropped (the kb row runs it), and so is the `nix shell nixpkgs#trealla` wrapper (the dev shell supplies tpl). test-evidence/tooling.md: both EOF appends kept, no heading lost (41 = union). Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze