fix: sanitize oversized image payloads

src/agents/pi-embedded-helpers.image-dimension-error.test.ts

@@ -0,0 +1,16 @@
+import { describe, expect, it } from "vitest";
+
+import { isImageDimensionErrorMessage, parseImageDimensionError } from "./pi-embedded-helpers.js";
+
+describe("image dimension errors", () => {
+  it("parses anthropic image dimension errors", () => {
+    const raw =
+      "400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.84.content.1.image.source.base64.data: At least one of the image dimensions exceed max allowed size for many-image requests: 2000 pixels\"}}";
+    const parsed = parseImageDimensionError(raw);
+    expect(parsed).not.toBeNull();
+    expect(parsed?.maxDimensionPx).toBe(2000);
+    expect(parsed?.messageIndex).toBe(84);
+    expect(parsed?.contentIndex).toBe(1);
+    expect(isImageDimensionErrorMessage(raw)).toBe(true);
+  });
+});