fix: Opus escalation graceful fallback on credit exhaustion

When Opus API call fails (credit balance, rate limit), keep Sonnet's
result instead of overwriting with INCONCLUSIVE API error. Only use
Opus result if it's actually better than Sonnet's attempt.

.claude/skills/comfy-qa/scripts/qa-record.ts

@@ -1971,19 +1971,35 @@ async function main() {
           process.env.QA_OPUS_ESCALATION !== '0'
         ) {
           console.warn('Escalating to claude-opus-4-6 for complex issue...')
-          research = await runResearchPhase({
-            page,
-            issueContext: issueCtx,
-            qaGuide: qaGuideText,
-            outputDir: opts.outputDir,
-            serverUrl: opts.serverUrl,
-            anthropicApiKey: anthropicKey,
-            model: 'claude-opus-4-6',
-            maxTurns: 30
-          })
-          console.warn(
-            `Opus result: ${research.verdict} — ${research.summary.slice(0, 100)}`
-          )
+          try {
+            const opusResult = await runResearchPhase({
+              page,
+              issueContext: issueCtx,
+              qaGuide: qaGuideText,
+              outputDir: opts.outputDir,
+              serverUrl: opts.serverUrl,
+              anthropicApiKey: anthropicKey,
+              model: 'claude-opus-4-6',
+              maxTurns: 30
+            })
+            console.warn(
+              `Opus result: ${opusResult.verdict} — ${opusResult.summary.slice(0, 100)}`
+            )
+            // Only use Opus result if it's better than Sonnet's
+            if (
+              opusResult.verdict !== 'INCONCLUSIVE' ||
+              !opusResult.summary.includes('API error')
+            ) {
+              research = opusResult
+            } else {
+              console.warn('Opus failed (API error) — keeping Sonnet result')
+            }
+          } catch (opusErr) {
+            console.warn(
+              `Opus escalation failed: ${opusErr instanceof Error ? opusErr.message : opusErr}`
+            )
+            // Keep Sonnet's result
+          }
         }
         console.warn(`Evidence: ${research.evidence.slice(0, 200)}`)