refactor: narrow web image input v1

packages/llm/llm-pi-ai/tests/provider-apis.e2e.ts

@@ -68,16 +68,10 @@ async function harness(image?: StoredImageAttachment): Promise<Context> {
     class E2eAttachmentStore extends AttachmentStore {
       readonly imageLimits: ImageAttachmentLimits = {
         maxImageBytes: fixture.data.byteLength,
-        maxImagesPerMessage: 1,
-        maxMessageImageBytes: fixture.data.byteLength,
         maxImagePixels: fixture.ref.width * fixture.ref.height,
         mediaTypes: [fixture.ref.mediaType],
       }
 
-      validateImage(_input: SaveImageAttachment): void {
-        throw new Error('e2e attachment fixture is read-only')
-      }
-
       saveImage(_input: SaveImageAttachment): Promise<ImageAttachmentRef> {
         return Promise.reject(new Error('e2e attachment fixture is read-only'))
       }
@@ -228,7 +222,7 @@ for (const profile of providerCases) {
                   type: 'text',
                   text: 'What type of machine-readable symbol is shown in the attached image? Reply with exactly: QR code',
                 },
-                { type: 'image', attachment: ref, alt: 'machine-readable symbol' },
+                { type: 'image', attachment: ref },
               ],
               source: { kind: 'plugin', plugin: 'test' },
             })],