docs: add vacation notice to coding-agent README

Author: mom

packages/coding-agent/README.md

@@ -1,3 +1,11 @@
+# 🏖️ OSS Vacation
+
+**Issue tracker and PRs reopen February 16, 2026.**
+
+All PRs will be auto-closed until then. Approved contributors can submit PRs after vacation without reapproval. For support, join [Discord](https://discord.com/invite/3cU7Bz4UPx).
+
+---
+
 <p align="center">
   <a href="https://shittycodingagent.ai">
     <img src="https://shittycodingagent.ai/logo.svg" alt="pi logo" width="128">