feat(pstack): port skill updates and default to Opus 5.5 and Grok 4.7 - #414

Bugbot Analysis Progress (2m 5s elapsed)

✅ Gathered PR context (2s)
✅ Completed bug detection (2m 3s)
✅ Posted analysis results (0s)

Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_44cd88de-570e-4fab-8425-407e837b295b