feat(core): normalize tool and attachment images at settlement (#37141)

packages/core/test/lib/image.ts

@@ -0,0 +1,7 @@
+import { Image } from "@opencode-ai/core/image"
+import { Effect, Layer } from "effect"
+
+/** Passthrough resizer for tests that build ToolRegistry.node without a Location. */
+export const imagePassthrough = Layer.mock(Image.Service, {
+  normalize: (_resource, content) => Effect.succeed(content),
+})