Split pinned app-server integration tests by behavior

Break the large integration test module into focused run, input, stream, turn-control, approval-mode, and lifecycle files with shared helpers for the mock Responses boundary.

Co-authored-by: Codex <noreply@openai.com>

sdk/python/tests/test_pinned_app_server_input_integration.py

@@ -0,0 +1,74 @@
+from __future__ import annotations
+
+from app_server_harness import AppServerHarness
+from openai_codex import Codex, ImageInput, LocalImageInput, TextInput
+from pinned_app_server_helpers import TINY_PNG_BYTES
+
+
+def test_remote_image_input_reaches_responses_api_through_pinned_app_server(
+    tmp_path,
+) -> None:
+    """Remote image inputs should survive the SDK and app-server boundary."""
+    remote_image_url = "https://example.com/codex.png"
+
+    with AppServerHarness(tmp_path) as harness:
+        harness.responses.enqueue_assistant_message(
+            "remote image received",
+            response_id="remote-image",
+        )
+
+        with Codex(config=harness.app_server_config()) as codex:
+            result = codex.thread_start().run(
+                [
+                    TextInput("Describe the remote image."),
+                    ImageInput(remote_image_url),
+                ]
+            )
+            request = harness.responses.single_request()
+
+    assert {
+        "final_response": result.final_response,
+        "contains_user_prompt": "Describe the remote image."
+        in request.message_input_texts("user"),
+        "image_urls": request.message_image_urls("user"),
+    } == {
+        "final_response": "remote image received",
+        "contains_user_prompt": True,
+        "image_urls": [remote_image_url],
+    }
+
+
+def test_local_image_input_reaches_responses_api_through_pinned_app_server(
+    tmp_path,
+) -> None:
+    """Local image inputs should become data URLs after crossing the app-server."""
+    local_image = tmp_path / "local.png"
+    local_image.write_bytes(TINY_PNG_BYTES)
+
+    with AppServerHarness(tmp_path) as harness:
+        harness.responses.enqueue_assistant_message(
+            "local image received",
+            response_id="local-image",
+        )
+
+        with Codex(config=harness.app_server_config()) as codex:
+            result = codex.thread_start().run(
+                [
+                    TextInput("Describe the local image."),
+                    LocalImageInput(str(local_image)),
+                ]
+            )
+            request = harness.responses.single_request()
+
+    assert {
+        "final_response": result.final_response,
+        "contains_user_prompt": "Describe the local image."
+        in request.message_input_texts("user"),
+        "image_url_is_png_data_url": request.message_image_urls("user")[-1].startswith(
+            "data:image/png;base64,"
+        ),
+    } == {
+        "final_response": "local image received",
+        "contains_user_prompt": True,
+        "image_url_is_png_data_url": True,
+    }