fix: write blob image to disk so model can view it

The blob attachment test was sending an inline image but the model
would try to view it on disk, resulting in 'file not found' errors
in the snapshot. Write the PNG to workDir so the view tool succeeds.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

nodejs/test/e2e/session_config.test.ts

@@ -44,16 +44,21 @@ describe("Session Configuration", async () => {
     });
 
     it("should accept blob attachments", async () => {
+        // Write the image to disk so the model can view it if it tries
+        const pngBase64 =
+            "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg==";
+        await writeFile(join(workDir, "pixel.png"), Buffer.from(pngBase64, "base64"));
+
         const session = await client.createSession({ onPermissionRequest: approveAll });
 
         await session.sendAndWait({
-            prompt: "Describe this image",
+            prompt: "What color is this pixel? Reply in one word.",
             attachments: [
                 {
                     type: "blob",
-                    data: "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg==",
+                    data: pngBase64,
                     mimeType: "image/png",
-                    displayName: "test-pixel.png",
+                    displayName: "pixel.png",
                 },
             ],
         });

test/snapshots/session_config/should_accept_blob_attachments.yaml

@@ -6,99 +6,22 @@ conversations:
         content: ${system}
       - role: user
         content: |-
-          Describe this image
-          test-pixel.png
+          What color is this pixel? Reply in one word.
+          pixel.png
           [image]
       - role: assistant
-        content: I'll view the image for you.
-      - role: assistant
-        tool_calls:
-          - id: toolcall_0
-            type: function
-            function:
-              name: report_intent
-              arguments: '{"intent":"Viewing image file"}'
-      - role: assistant
-        tool_calls:
-          - id: toolcall_1
-            type: function
-            function:
-              name: view
-              arguments: '{"path":"${workdir}/test-pixel.png"}'
-  - messages:
-      - role: system
-        content: ${system}
-      - role: user
-        content: |-
-          Describe this image
-          test-pixel.png
-          [image]
-      - role: assistant
-        content: I'll view the image for you.
         tool_calls:
           - id: toolcall_0
-            type: function
-            function:
-              name: report_intent
-              arguments: '{"intent":"Viewing image file"}'
-          - id: toolcall_1
             type: function
             function:
               name: view
-              arguments: '{"path":"${workdir}/test-pixel.png"}'
+              arguments: '{"path":"${workdir}/pixel.png"}'
       - role: tool
         tool_call_id: toolcall_0
-        content: Intent logged
-      - role: tool
-        tool_call_id: toolcall_1
-        content: Path ${workdir}/test-pixel.png does not exist. Please provide a valid path.
-      - role: assistant
-        content: Let me check the current directory to locate the image file.
-      - role: assistant
-        tool_calls:
-          - id: toolcall_2
-            type: function
-            function:
-              name: ${shell}
-              arguments: '{"command":"Get-ChildItem -Recurse -Filter \"test-pixel.png\"","description":"Find test-pixel.png file"}'
-  - messages:
-      - role: system
-        content: ${system}
+        content: Viewed image file successfully.
       - role: user
         content: |-
-          Describe this image
-          test-pixel.png
+          Image file at path ${workdir}/pixel.png
           [image]
       - role: assistant
-        content: I'll view the image for you.
-        tool_calls:
-          - id: toolcall_0
-            type: function
-            function:
-              name: report_intent
-              arguments: '{"intent":"Viewing image file"}'
-          - id: toolcall_1
-            type: function
-            function:
-              name: view
-              arguments: '{"path":"${workdir}/test-pixel.png"}'
-      - role: tool
-        tool_call_id: toolcall_0
-        content: Intent logged
-      - role: tool
-        tool_call_id: toolcall_1
-        content: Path ${workdir}/test-pixel.png does not exist. Please provide a valid path.
-      - role: assistant
-        content: Let me check the current directory to locate the image file.
-        tool_calls:
-          - id: toolcall_2
-            type: function
-            function:
-              name: ${shell}
-              arguments: '{"command":"Get-ChildItem -Recurse -Filter \"test-pixel.png\"","description":"Find test-pixel.png file"}'
-      - role: tool
-        tool_call_id: toolcall_2
-        content: <exited with exit code 0>
-      - role: assistant
-        content: The file doesn't appear to be in the working directory. Could you please upload or provide the image file
-          again? I'll be happy to describe it once I can access it.
+        content: Red