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The old backend/.golangci.yml declared version "2" but used v1 schema keys, so under v2 it never validated and its thresholds were inert: the linter ran at defaults. Replace it verbatim with the org-standard file, repin the Dockerfile.backend lint stage from golangci-lint v2.7.2 to v2.12.2, and assert the config's sha256 as the first step of the backend lint target so it cannot silently drift again -- a local hash check against a constant, no network. With the config loading, lll flags one over-long line; wrap it and the two others named on the issue, moving each //nolint justification above the code line, and drop a dead //nolint:wsl (wsl is disabled by the standard config). TODO.md updated. Model: opus-4-8