Install superpowers and use its review skill

run.ts

@@ -68,16 +68,32 @@ async function postResult(body: string): Promise<void> {
   });
 }
 
+async function run(command: string, args: string[]): Promise<void> {
+  const { success, code } = await new Deno.Command(command, { args }).output();
+  if (!success) throw new Error(`${command} ${args[0]} exited with ${code}`);
+}
+
 // Commits belong to the same account as the pull request they end up in.
 async function configureGitAuthor(): Promise<void> {
   const user: GiteaUser = await (await gitea(AUTHOR_TOKEN, "user")).json();
   for (const [key, value] of [["name", user.login], ["email", user.email]]) {
-    await new Deno.Command("git", {
-      args: ["config", "--global", `user.${key}`, value],
-    }).output();
+    await run("git", ["config", "--global", `user.${key}`, value]);
   }
 }
 
+// The superpowers plugin gives the agent its skills, including the code review
+// one that the prompt asks for. Both installs are idempotent on the persisted
+// home.
+async function installSuperpowers(bot: string): Promise<void> {
+  const commands = bot === "claude"
+    ? [
+      ["plugin", "marketplace", "add", "obra/superpowers-marketplace"],
+      ["plugin", "install", "-y", "superpowers@superpowers-marketplace"],
+    ]
+    : [["plugin", "add", "superpowers@openai-curated-remote"]];
+  for (const args of commands) await run(bot, args);
+}
+
 async function renderPrompt(): Promise<string> {
   const comments: GiteaComment[] = await (await gitea(
     REVIEWER_TOKEN,
@@ -89,9 +105,6 @@ async function renderPrompt(): Promise<string> {
       .map((c) => `## ${c.user.login} at ${c.created_at}\n\n${c.body}\n`)
       .join("\n"),
     CODE_RULES: await (await gitea(REVIEWER_TOKEN, RULES_PATH)).text(),
-    REVIEW_GUIDE: await Deno.readTextFile(
-      new URL("review.md", import.meta.url),
-    ),
     EVENT_NAME: EVENT,
     GITEA_API_URL: API,
     GITEA_REPOSITORY: REPO,
@@ -114,6 +127,7 @@ async function runClaude(prompt: string): Promise<string> {
     );
     Deno.exit(1);
   }
+  await installSuperpowers("claude");
   const claude = new Deno.Command("claude", {
     args: [
       "--print",
@@ -177,6 +191,7 @@ async function runCodex(prompt: string): Promise<string> {
   })
     .output();
   if (!loggedIn.success) await codexDeviceLogin();
+  await installSuperpowers("codex");
   const file = await Deno.makeTempFile();
   const status = await new Deno.Command("codex", {
     args: [