contributions: issues and pull requests are open

The workflow that closed every pull request on arrival is gone, the README's closed-doors
notice becomes a short Contributing section, and CONTRIBUTING.md says how to report a bug.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

README.md

@@ -8,12 +8,6 @@
   </p>
 </div>
 
-> [!IMPORTANT]
-> **Issues are off, and pull requests are not open yet.** [`docs/CONTRIBUTING.md`](docs/CONTRIBUTING.md)
-> says what will get in when they are. Until then, the way to contribute is to join the
-> [Discord](https://discord.gg/wJSJx467G4) and report the bugs you find. Questions and ideas are
-> welcome in the same place.
-
 benilla speaks the original 1.12.1 protocol, so it connects to any server the real client could,
 and reads its game data at runtime from your own 1.12.1 install. Every file format and the network
 protocol are implemented from scratch, with no original client code, no third-party WoW crates,
@@ -74,6 +68,12 @@ at any IP or hostname, appending the auth port if yours is remapped
 (`WOW_HOST=play.example.com:5000`). Credentials go in at the login screen, or set `WOW_USER` /
 `WOW_PASS` to skip it.
 
+## Contributing
+
+Issues and pull requests are open. [`docs/CONTRIBUTING.md`](docs/CONTRIBUTING.md) says what gets
+in and how a change is judged. Bugs, questions and ideas are welcome on the
+[Discord](https://discord.gg/wJSJx467G4) too.
+
 ---
 
 Early inspiration and file format guidance came from the