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CI / ci (push) Failing after 4m7s
Merge check and build-and-cache into one job to eliminate redundant nix-setup step. Saves ~1m43s per run. - PRs: checkout → nix-setup → flake check - Main pushes: same + build/sign/cache all packages Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>