- head -3 → head -10 in check() to show full error messages
- Group 16: 100KB instead of 250KB to avoid argv overflow
- Batch 11+, dupID: add pattern "Maximum" and "Two.or.more"
- QueueNotFound: add pattern "specified"
- ChangeVisibility: fix pattern for "in flight" vs "not.in"
- 3 FAILs remain: AWS client-side validation (VT<0), WaitTime>20, no server-side validation