test(wp7-02): enforce exact image dimensions

scripts/lib/wp7-02-controlled-executor.mjs

@@ -192,6 +192,27 @@ export function normalizeProviderResponse(modelConfig, response) {
   };
 }
 
+export function describeProviderResponseShape(value, depth = 0) {
+  if (depth >= 6) return { kind: "depth_limit" };
+  if (Array.isArray(value)) {
+    return {
+      item: value.length > 0 ? describeProviderResponseShape(value[0], depth + 1) : { kind: "empty" },
+      kind: "array",
+      length: value.length,
+    };
+  }
+  if (value && typeof value === "object") {
+    return {
+      fields: Object.keys(value).toSorted().map((name) => ({ name, shape: describeProviderResponseShape(value[name], depth + 1) })),
+      kind: "object",
+    };
+  }
+  if (typeof value === "string") return { kind: "string", size: value.length === 0 ? "empty" : value.length > 256 ? "large" : "small" };
+  if (typeof value === "number") return { kind: "number" };
+  if (typeof value === "boolean") return { kind: "boolean" };
+  return { kind: value === null ? "null" : "undefined" };
+}
+
 export function buildSanitizedResponseEvidence(normalized) {
   const evidence = {
     dimensions: structuredClone(normalized.dimensions),
@@ -237,7 +258,16 @@ export async function executeProviderRequest({ fetchImpl = fetch, modelConfig, p
     });
     const durationMs = Math.round(performance.now() - startedAt);
     if (!response.ok) throw new Error(`WP7_02_UPSTREAM_HTTP_${response.status}`);
-    const normalized = normalizeProviderResponse(modelConfig, await response.json());
+    const providerResponse = await response.json();
+    let normalized;
+    try {
+      normalized = normalizeProviderResponse(modelConfig, providerResponse);
+    } catch (error) {
+      if (error instanceof Error && /^WP7_02_[A-Z0-9_]+$/.test(error.message)) {
+        error.safe_response_shape = describeProviderResponseShape(providerResponse);
+      }
+      throw error;
+    }
     return {
       duration_ms: durationMs,
       http_status: response.status,