A push that lands while a reviewer run is in flight is delivered as a
queued message into the still-running first-review run, whose
configurable still has re_review=False. The empty-review guard in
publish_review only skipped the 'No issues found' summary when
is_re_review was True, so the queued reconcile published a second,
duplicate top-level 'No issues found' review.
Key the empty-review skip off actual PR state instead: add
open_swe_review_exists(), which detects the marker render_review_body
embeds in every Open SWE review body, and skip the summary when a prior
Open SWE review already exists (regardless of the re_review flag). Fails
open on API error so a genuine first review is never suppressed.
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