Implement proper buffering for PASS lines in summary mode: - PASS lines are buffered when -Summary/--summary is active - WARN and FAIL lines print immediately (never buffered) - On success: buffer is discarded, print tally line only - On failure: buffer is flushed before tally line Revert out-of-scope try/catch around Python command (not part of Task 4). Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>