validate

# Validate copilot.fish changes ## When to use - After modifying `completions/copilot.fish` - After modifying files in `functions/` - Before opening or updating a pull request ## Instructions 1. Run syntax checks: ```fish fish -n completions/copilot.fish fish -n functions/*.fish ``` 2. Run targeted completion checks: ```fish complete -C"copilot --mo" complete -C"copilot --agent " complete -C"copilot plugin marketplace " ``` 3. Verify wrapper function loading: ```fish source functions/yopilot.fish && functions -q yopilot ``` 4. If a check fails, apply minimal fixes and rerun all checks.