# 163 - 2026-03-29: Vision assistant envelope extension

**Status**: ✅ Completed  
**Type**: Vision Contract / Structured Output  
**Task**: TASK-121-01-01

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## Summary

Extended the reusable `vision_assistant` result envelope so later correction
loops can consume more than one summary sentence.

Added optional structured fields:

- `backend_name`
- `shape_mismatches`
- `proportion_mismatches`
- `next_corrections`

The change stays backward-compatible: the earlier fields remain in place and
the new fields default to empty values when the backend does not provide them.
