Round-1 blocker (grok; claude's box twin): a pull_request run from a
public fork gets a read-only GITHUB_TOKEN — permissions: cannot raise
it — and every ceremony PR this org merges is cross-repo from the bot
fork, so the tag create would 403 after green asserts, red on main per
release. The door now triggers on push to main (in-repo event, full
token); the decide step reads the transition from event.before (first-
parent fallback for the all-zeros edge) and the release label — still
the operator's declared intent — via the API off the merge commit's PR.
A transition with no labeled PR behind it refuses. The steps split on
the pushed ref: tags to the tag path, main to the merge path.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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