feat: add 'fix-pr' skill for agentic iterative PR fixing

.gemini/skills/offload/scripts/playbooks/fix.ts

@@ -0,0 +1,18 @@
+import { spawnSync } from 'child_process';
+import path from 'path';
+
+export async function runFixPlaybook(prNumber: string, targetDir: string, policyPath: string, geminiBin: string) {
+  console.log(`🚀 Offload | FIX | PR #${prNumber}`);
+  console.log('Switching to agentic fix loop inside Gemini CLI...');
+
+  // Use the nightly gemini binary to activate the fix-pr skill and iterate
+  const result = spawnSync(geminiBin, [
+    '--policy', policyPath,
+    '--cwd', targetDir,
+    '-p', `Please activate the 'fix-pr' skill and use it to iteratively fix PR #${prNumber}. 
+           Ensure you handle CI failures, merge conflicts, and unaddressed review comments 
+           until the PR is fully passing and mergeable.`
+  ], { stdio: 'inherit' });
+
+  return result.status || 0;
+}