Add a `skip_comment` workflow_dispatch input (default false). When set,
the "Comment exploration report" step is skipped, so a validation/dry
run can exercise the full pipeline and produce the report artifact
without posting a public comment on the target PR (useful when testing
against an external contributor's PR). The report is still uploaded as
an artifact for review.
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>