Round-1 blocker (grok, claude on box#97's 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 version transition from event.before
(first-parent fallback for the all-zeros edge), and the release label —
still the operator's declared intent — is read via the API off the merge
commit's PR. A transition with no labeled PR behind it refuses. The two
doors now split on the pushed ref: tags to the tag door, main to this one.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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