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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 to golangci-lint 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, no network. The standard config surfaces findings only in the tests: the repeated IP literals in middleware_test.go become named constants (goconst) and its request switches to NewRequestWithContext (noctx). reportbuf.go's gosec suppression gains a plain justification comment. The rest of the backend, including the fx-based server lifecycle, is already clean. TODO.md updated. Model: opus-4-8