fix(cicd): keep branch follower debug JSON parseable

scripts/src/cicd-branch-follower.ts

@@ -2862,16 +2862,39 @@ function parseJsonObject(text: string): Record<string, unknown> | null {
     const parsed = JSON.parse(trimmed) as unknown;
     return asOptionalRecord(parsed);
   } catch {
-    const start = trimmed.indexOf("{");
-    const end = trimmed.lastIndexOf("}");
-    if (start < 0 || end <= start) return null;
-    try {
-      const parsed = JSON.parse(trimmed.slice(start, end + 1)) as unknown;
-      return asOptionalRecord(parsed);
-    } catch {
-      return null;
+    return parseFirstJsonObject(trimmed);
+  }
+}
+
+function parseFirstJsonObject(text: string): Record<string, unknown> | null {
+  const start = text.indexOf("{");
+  if (start < 0) return null;
+  let depth = 0;
+  let inString = false;
+  let escaped = false;
+  for (let index = start; index < text.length; index += 1) {
+    const char = text[index];
+    if (inString) {
+      if (escaped) escaped = false;
+      else if (char === "\\") escaped = true;
+      else if (char === "\"") inString = false;
+      continue;
+    }
+    if (char === "\"") inString = true;
+    else if (char === "{") depth += 1;
+    else if (char === "}") {
+      depth -= 1;
+      if (depth === 0) {
+        try {
+          const parsed = JSON.parse(text.slice(start, index + 1)) as unknown;
+          return asOptionalRecord(parsed);
+        } catch {
+          return null;
+        }
+      }
     }
   }
+  return null;
 }
 
 function recordAt(root: Record<string, unknown>, path: string[]): Record<string, unknown> | null {