[gmh5225]

Tag-triggered builds currently grant asset replacement automatically. Pushing the r4 tag rebuilt and replaced all three already-published host packages, breaking consumers that had pinned the original digests. Tag pushes now refuse an existing release and carry overwrite=false through publication; explicit manual replacement retains its existing opt-in.

The release preparation job runs eight offline checks against its actual Bash admission step. They cover existing and new tags, explicit manual replacement, immutable releases, lookup failures, version mismatches, and artifact-only dispatch. The two tag-push checks fail before this fix; all eight pass afterward. git diff --check also passes. No LLVM compilation or library behavior changes.

[github-actions]

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