refactor(models): unify preset names

nanobot/agent/model_presets.py

@@ -79,7 +79,9 @@ def normalize_preset_name(name: str | None, presets: dict[str, ModelPresetConfig
     if not isinstance(name, str) or not name.strip():
         raise ValueError("model_preset must be a non-empty string")
     name = name.strip()
-    if name not in presets:
-        raise KeyError(f"model_preset {name!r} not found. Available: {', '.join(presets) or '(none)'}")
-    return name
-
+    if name in presets:
+        return name
+    matches = [candidate for candidate in presets if candidate.casefold() == name.casefold()]
+    if len(matches) == 1:
+        return matches[0]
+    raise KeyError(f"model_preset {name!r} not found. Available: {', '.join(presets) or '(none)'}")

nanobot/agent/tools/runtime_control.py

@@ -235,7 +235,6 @@ def _snapshot_model_presets(
 ) -> dict[str, dict[str, object]]:
     return {
         name: {
-            "label": preset.label,
             "model": preset.model,
             "provider": preset.provider,
             "max_tokens": preset.max_tokens,