Previously the workflow's `if:` only checked the event type and the
presence of `@claude` in the body. The job would start for any commenter
and only later fail when the action attempted privileged operations on
behalf of a user without write access. That produced noisy red runs and
wasted runner minutes for what is effectively an authorization rejection.
Add an `author_association` check (OWNER, MEMBER, or COLLABORATOR) to
each of the four trigger branches (issue_comment, pull_request_review_comment,
pull_request_review, issues), so the job is short-circuited at workflow
evaluation time and never starts for unauthorized invokers.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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