chore: import upstream snapshot with attribution

tools/image_response.py

@@ -0,0 +1,40 @@
+from __future__ import annotations
+
+import base64
+from io import BytesIO
+from typing import Any
+
+from PIL import Image
+
+
+def image_from_response_part(part: Any) -> Image.Image | None:
+    inline_data = getattr(part, "inline_data", None)
+    if inline_data is None and isinstance(part, dict):
+        inline_data = part.get("inline_data")
+    if inline_data is None:
+        return None
+
+    as_image = getattr(part, "as_image", None)
+    if callable(as_image):
+        image = as_image()
+        if isinstance(image, Image.Image):
+            return image
+
+    data = _value(inline_data, "data")
+    if data is None:
+        return None
+    if isinstance(data, str):
+        if data.startswith("data:") and "," in data:
+            data = data.split(",", 1)[1]
+        data = base64.b64decode(data)
+    if isinstance(data, bytearray):
+        data = bytes(data)
+    if not isinstance(data, bytes):
+        return None
+    return Image.open(BytesIO(data)).convert("RGB")
+
+
+def _value(obj: Any, key: str) -> Any:
+    if isinstance(obj, dict):
+        return obj.get(key)
+    return getattr(obj, key, None)