Release/4.1.0

[Codengineer]

Proposed change(s)

Merging release branch back in develop. Please validate the changelog and verify other changes required to upgrade the version number.

Useful links (Github issues, JIRA tickets, ML-Agents forum threads etc.)

Types of change(s)

• Bug fix
• New feature
• Code refactor
• Breaking change
• Documentation update
• Other (please describe)

Checklist

• Added tests that prove my fix is effective or that my feature works
• Updated the changelog (if applicable)
• Updated the documentation (if applicable)
• Updated the migration guide (if applicable)

Other comments

[u-pr]

💡 Harness Review

The version bump is mostly consistent, but the release metadata around it is still partly on the previous release and should be finished before this lands.

This release PR updates the package to 4.1.0, but the repo still advertises 4.0.0 as the latest stable release. Readme.md:32-41 says the table shows the latest release while still listing Release 23 / 4.0.0, and com.unity.ml-agents/Documentation~/Installation.md:100-106 still tells users to git clone --branch release_23 as the latest stable release. After merging, those docs will keep sending users to the previous release instead of 4.1.0. Please update the latest-release table/clone instructions and audit the other release-specific links that still mention release_23 or 4.0.0 in the same PR.

_{Reviewed commit c197d1fc}

_{🤖 Helpful? 👍/👎}

[OliviaBayley]

Added some formatting changes (mostly monospace and end-sentence full-stop) to the changelog for consistency with the Unity style guide, but looks good once committed.

[montplaisir]

Tested locally 👍