docs: document list_models_cmd forms in README and validate space-separated model lists

Author: jzhu

README.md

@@ -19,6 +19,7 @@ Repository layout
   - mcp/: MCP subsystem with manager, CLI, server registry JSONs. (files: code_assistant_manager/mcp/manager.py, server_commands.py, cli.py, registry/servers/*.json)
   - menu/: Terminal UI components and centered menus used to select tools interactively.
   - config.py, env_loader.py: Configuration parsing and .env helper utilities.
+  - list_models_cmd supports three forms now: (1) a python module invocation (e.g. "python -m code_assistant_manager.litellm_models"), (2) legacy shell commands (e.g. "curl ... | jq -r '.data.[].id'"), and (3) a plain space-separated model list (e.g. "qwen3-max qwen3-coder-plus").
 
 - tests/: Pytest test suite (unit, integration, interactive). Test configuration in pytest.ini. Run with: python -m pytest tests/
 

code_assistant_manager/config.py

@@ -531,6 +531,14 @@ def validate_command(value: str) -> bool:
     if not parts:
         return False
 
+    # Allow plain space-separated model lists (e.g., "qwen3-max qwen3-coder-plus")
+    try:
+        if all(validate_model_id(p) for p in parts):
+            return True
+    except Exception:
+        # If validate_model_id is not suitable for a token, fall back to executable checks
+        pass
+
     # Validate executable (first part)
     executable = parts[0]