Fold review details

run.ts

@@ -52,6 +52,16 @@ async function postComment(body: string): Promise<void> {
   });
 }
 
+// A review must read at a glance: when the agent left more than VISIBLE_BYTES
+// outside <details> blocks, the whole review folds under its verdict line.
+const VISIBLE_BYTES = 512;
+function fold(body: string): string {
+  const visible = body.replace(/<details>[\s\S]*?<\/details>/g, "");
+  if (new TextEncoder().encode(visible).length <= VISIBLE_BYTES) return body;
+  const verdict = body.match(/\*\*Ready to merge\?\*\*.*/)?.[0] ?? "Review";
+  return `${verdict}\n\n<details>\n<summary>Details</summary>\n\n${body}\n\n</details>`;
+}
+
 // A pull request event is a review request, so the response becomes a review:
 // changes are requested when the agent asked @bot to fix something, a failed
 // run only comments, and anything else approves.
@@ -63,7 +73,7 @@ async function postResult(body: string): Promise<void> {
     ? "COMMENT"
     : "APPROVED";
   await gitea(REVIEWER_TOKEN, `repos/${REPO}/pulls/${INDEX}/reviews`, {
-    body: stripAnsi(body),
+    body: fold(stripAnsi(body)),
     event,
   });
 }