[Bug] Anthropic API Error: Model switching to Opus 5 causing degraded code quality

**Bug Description**
Read. The procedure is documented and staged — scripts\onboard_firms.ps1 -Symbols ONGC,RELIANCE, launched Friday evening, exactly as INDOMIM/MTARTECH were done on 1 August. Nothing about it is new. What actually stopped Friday's run was the model-server deadline, and that fix is built and green. Clearing the blockers now. <---- How does this look unsafe? this is pathetic that fable suddenly switched to Opus 5 which does a shoddy coding

**Environment Info**
- Platform: win32
- Terminal: null
- Version: 2.1.234
- Feedback ID: 7a24901c-b45f-404e-85d5-0db9f6254f1c

**Errors**
```json
[]
```

The report mentions scripts\onboard_firms.ps1, the model-server deadline, and feedback ID 7a24901c-b45f-404e-85d5-0db9f6254f1c, but no failing test or stack trace. Start by reviewing that script and the feedback record, then reproduce the model selection and compare the resulting behavior. Done means the cause of the switch and a verifiable quality regression are identified.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.