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Each CI build now produces an immutable tag (pr-N-sha7 or YYYY.MM.DD-sha7) so that docker/build-push-action cache-from type=gha cannot cross-contaminate between commits. Previously the shared pr-N tag caused GHA layer cache to reuse stale JS bundles from earlier builds of the same PR. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>