Missing `/editor-model` command - editor model cannot be changed during architect/editor mode

[chemtov]

Issue

The /editor-model command is missing from cecli, making it impossible to change the editor model when using architect/editor mode. While /model and /weak-model commands exist, there's no equivalent for the editor model.

Expected Behavior

Users should be able to change the editor model using /editor-model <model-name>, similar to how /weak-model works.

Current Behavior

• /model command exists ✅
• /weak-model command exists ✅
• /editor-model command is missing ❌

Technical Context

The infrastructure already exists in the codebase:

• editor_model_name and editor_edit_format attributes in ModelSettings class
• get_editor_model() method in Model class
• Editor model validation in sanity_check_models()

Root Cause

During the command refactoring (commit 82ba8977b) that decomposed commands.py into individual files, the /weak-model command was implemented (cecli/commands/weak_model.py) but /editor-model was not.

Implementation Notes

The missing command should follow the same pattern as WeakModelCommand in cecli/commands/weak_model.py, but modify editor_model_name instead of weak_model_name.

Version and model info

cecli v0.95.12.dev1
Relevant for all models using architect/editor mode