docs: add link to AGENTS.md in CONTRIBUTING.md (#5121)

* add link to AGENTS.md in CONTRIBUTING.md

Assisted-by: Claude Sonnet 4.6

* Update CONTRIBUTING.md: fix broken link

---------

Co-authored-by: Emídio Neto <9735060+emdneto@users.noreply.github.com>
Co-authored-by: Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>

Author: 3 people

CONTRIBUTING.md

@@ -13,6 +13,8 @@ Before you can contribute, you will need to sign the [Contributor License Agreem
 
 Please also read the [OpenTelemetry Contributor Guide](https://github.com/open-telemetry/community/blob/main/guides/contributor/README.md).
 
+If you are using AI agents to assist with contributions, please read [AGENTS.md](AGENTS.md) for guidance on how to use them responsibly in this project.
+
 # Find your right repo
 
 This is the main repo for OpenTelemetry Python. Nevertheless, there are other repos that are related to this project.
@@ -144,7 +146,7 @@ CONTRIB_REPO_SHA=dde62cebffe519c35875af6d06fae053b3be65ec tox
 ```
 
 The continuation integration overrides that environment variable with as per the configuration
-[here](https://github.com/open-telemetry/opentelemetry-python/blob/main/.github/workflows/test_0.yml#L14).
+[here](https://github.com/open-telemetry/opentelemetry-python/blob/main/.github/workflows/test.yml#L14).
 
 ### Benchmarks