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golangci-lint no longer runs on the host. script/lint builds Dockerfile.lint, which copies the repo into the digest-pinned linter image, so the container holds only this repo and the cross-worktree cache contamination of #106 becomes structurally impossible rather than filtered after the fact. Five workers hit that contamination in one evening, in both directions. Three properties are load-bearing. --no-cache-filter=lint forces the lint stage to re-execute while deps keeps its cache, because a cached build lints nothing in 0.27s and exits 0. script/lint does not trust that flag, since Docker silently ignores an unmatched stage name: it asserts golangci-lint's own summary line appears, so no summary means no lint whatever the exit code says. And both lint steps run --network=none, which enforces rather than assumes that config verify does not fetch its schema — verify is kept, because golangci-lint run silently ignores unrecognized config keys and it is the only thing that catches a typo that disables a setting. Independently reviewed four times. Three passed the behaviour; the remaining rounds were a README merge against #151, whose premise was that the file contains no false statements. Six statements this change falsified were found and corrected across those rounds — the last reviewer re-derived every countable claim against the tree rather than reading for plausibility, and found no seventh. Supersedes #106.