[mjcarroll]

Description

Adds an AGENTS.md aimed at AI agents and a short section in CONTRIBUTING.md linking the ROS guidelines for AI-assisted contributions, Making a PR and the Developer Guide.

The main points for agents: don't open a PR unless the human has built, tested and read the diff; never claim verification that wasn't run; use the PR template; sign-off and disclosure rules.

AGENTS.md is deliberately not rclcpp-specific so it can be reused across ROS 2 repos. Opening as a draft to collect feedback on wording and on whether we want to adopt it org-wide, along with a PR template check for closing non-conforming PRs.

Is this user-facing behavior change?

No, docs only.

Did you use Generative AI?

Claude (Sonnet 5.5).

Additional Information

[github-actions]

ABI Compliance Check

✅ Verdict: compatible

Library	Verdict	Summary
libcomponent_manager.so	✅ compatible	No ABI changes detected.
librclcpp.so	✅ compatible	No ABI changes detected.
librclcpp_action.so	✅ compatible	No ABI changes detected.
librclcpp_lifecycle.so	✅ compatible	No ABI changes detected.

✅ libcomponent_manager.so — full abidiff report

Compared:

• Base: lib-base/libcomponent_manager.so
• Head: lib-pr/libcomponent_manager.so @ 61484a3

(empty report — no differences printed by abidiff)

✅ librclcpp.so — full abidiff report

Compared:

• Base: lib-base/librclcpp.so
• Head: lib-pr/librclcpp.so @ 61484a3

(empty report — no differences printed by abidiff)

✅ librclcpp_action.so — full abidiff report

Compared:

• Base: lib-base/librclcpp_action.so
• Head: lib-pr/librclcpp_action.so @ 61484a3

(empty report — no differences printed by abidiff)

✅ librclcpp_lifecycle.so — full abidiff report

Compared:

• Base: lib-base/librclcpp_lifecycle.so
• Head: lib-pr/librclcpp_lifecycle.so @ 61484a3

(empty report — no differences printed by abidiff)

_{Updated for commit 61484a3 · check run · suppressions: /home/runner/work/_temp/ros2-abi-suppressions.txt}

[christophebedard]

I do think we should try this out. And we should try it out in a single repo for some time first