fix(pr-review): one visible review per pull request, and a confidence that holds a known bug below safe - #1973

🟢 Confidence 10/10 · safe to merge
Test-only diff; every assertion matches the code it pins (MAX_LENGTH_REFUSALS = 4, overlongFinding wording, formatCount rounding).
_{no findings · tests covered · risk low}

Third commit adds the tests the earlier rounds asked for: the length-refusal cap, the close-out exemption and the once-only submit refusal, plus issue grouping and the brief comment section. Test-only, no production code touched.

Fixed since the last review

• ✅ F1 · The close-out exemption of the new submit-review length refusal (`partial
• ✅ F2 · The new groupIssues summation, the (N issues) row suffix and the details no longer being open have no test
• ✅ F3 · Brief rendering of telemetry (renderTelemetryMarkdown brief early return) is untested: no assertion covers the comment dropping the traffic table, added/removed spans and log cost notes while the …
• ✅ F4 · renderTelemetryMarkdown's brief cut is asserted against no telemetry

Production impact

_{346cd13 · Updated on every push. Reply "won't fix" to dismiss a finding, or mention @maple-review-bot to ask about one.}