Preserve annotated tag during release checkout

[zrack]

Summary

• restore the remote annotated tag object after actions/checkout
• verify the restored tag peels to the workflow commit before release tooling runs
• prevent strict release builds from observing a lightweight tag ref

Evidence

• reproduced the checkout ref overwrite in a temporary clone
• verified the exact fetch and tag-object checks restore the annotated tag
• YAML parses successfully

This must land before recreating the unpublished v0.1.0 tag.