feat(workspaces): transform workspaces feature into a distributable extension

extensions/workspaces/scripts/playbooks/ready.ts

@@ -0,0 +1,17 @@
+import { TaskRunner } from '../TaskRunner.ts';
+import path from 'path';
+
+export async function runReadyPlaybook(prNumber: string, targetDir: string, policyPath: string, geminiBin: string) {
+  const runner = new TaskRunner(
+    path.join(targetDir, `.gemini/logs/workspace-${prNumber}`),
+    `🚀 Workspace | READY | PR #${prNumber}`
+  );
+
+  runner.register([
+    { id: 'clean', name: 'Clean Workspace', cmd: `npm run clean && npm ci` },
+    { id: 'preflight', name: 'Full Preflight', cmd: `npm run preflight`, dep: 'clean' },
+    { id: 'conflicts', name: 'Main Conflict Check', cmd: `git fetch origin main && git merge-base --is-ancestor origin/main HEAD` }
+  ]);
+
+  return runner.run();
+}