Fixes the blocking Lint job's own ci.yml cache: PR #11963 removed the stale restore-keys fallback from quality.yml but left ci.yml's two "Restore ESLint file cache" steps carrying the same prefix-match fallback that lets a cache from a different lint config report stale per-file verdicts. Byte-level parity with #11963's already-merged fix.
Deliberately half of #11600 — the other half (run-eslint-json.mjs) is covered by PR #11983 from a parallel session, so the two don't collide on the same file.
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