Remove the hardcoded mistral default so gnoma starts without any
provider configured. TUI mode uses a stubProvider that lets CLI agent
arms (claude, gemini, etc.) handle routing; pipe mode prints a clear
setup message.
Also: gnoma slm setup now auto-writes the default model_url to the
global config when none is set, instead of erroring.
- ctrl+o toggles between 10-line truncated and full tool output
- Label shows "ctrl+o to expand" (lowercase)
- Fixed: auto permission mode now sticks — config default was
overriding flag default ("default" → "auto" in config defaults)