Merge pull request #278 from adcontextprotocol/bokelley/seed-ipr-check

docs(readme): note AAO IPR Policy requirement for contributors

Author: bokelley

README.md

@@ -1371,7 +1371,7 @@ ruff check src/ tests/
 
 ## Contributing
 
-Contributions welcome! See [CONTRIBUTING.md](CONTRIBUTING.md) for guidelines.
+Contributions welcome! See [CONTRIBUTING.md](CONTRIBUTING.md) for guidelines. All contributors must agree to the [AgenticAdvertising.Org IPR Policy](https://github.com/adcontextprotocol/adcp/blob/main/IPR_POLICY.md) — the bot prompts new contributors on their first PR and a single signature covers all AAO repositories.
 
 ## License