aisman

Session 135, Step 24: Silently update local instructions when user has not edited them
- AIM-1967 Silently update local instructions when user has not edited them
- AIM-2914 Correct server-to-local instructions replacement in the diff overlay
- AIM-2915 Keep diff overlay columns vertically synchronized
- AIM-2916 Restore previous and next diff navigation
- AIM-2917 Close the diff overlay after saving local instructions
- AIM-2918 Show a green identical-files state in the diff overlay

Outcome:
Implemented the diff overlay fixes for server-to-partial-file replacement, wrapped-row alignment, navigation, save behavior, and identical-file status.

Session 135, Step 25: Normalize provider-prefixed model names during output import
- AIM-2914 Normalize provider-prefixed model names during output import

Outcome:
Fixed output import model normalization and removed the invalid AiAgent-to-AiTool foreign key that rejected new model records.