fix(wp7-02): classify Gemini response text safely

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

@@ -206,6 +206,24 @@ export function normalizeProviderResponse(modelConfig, response) {
 }
 
 export function describeProviderResponseShape(value, depth = 0) {
+  if (typeof value === "string") {
+    const trimmed = value.trim();
+    const representation = /^data:image\/(?:jpeg|png|webp);base64,/i.test(trimmed)
+      ? "inline_media"
+      : /!\[[^\]]*\]\(\s*https?:\/\/[^)\s]+\s*\)/i.test(trimmed)
+        ? "markdown_uri"
+        : /^https?:\/\/\S+$/i.test(trimmed)
+          ? "uri"
+          : "plain_text";
+    return {
+      kind: "string",
+      representation,
+      size: value.length === 0 ? "empty" : value.length > 256 ? "large" : "small",
+    };
+  }
+  if (typeof value === "number") return { kind: "number" };
+  if (typeof value === "boolean") return { kind: "boolean" };
+  if (value === null || value === undefined) return { kind: value === null ? "null" : "undefined" };
   if (depth >= 6) return { kind: "depth_limit" };
   if (Array.isArray(value)) {
     return {
@@ -220,10 +238,7 @@ export function describeProviderResponseShape(value, depth = 0) {
       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" };
+  return { kind: "undefined" };
 }
 
 export function buildSanitizedResponseEvidence(normalized) {