Adopt the AI policy in all of our ros2_rust repos

Author: maspe36

AGENTS.md

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+# Agent Instructions
+
+## AI Policy
+Follow the projects [AI Policy](https://github.com/ros2-rust/ros2_rust/blob/main/docs/AI_POLICY.md). It applies to all contributions to this repository even if a human edits it.
+
+## Commit Authoring
+For any commit that includes content generated in whole or in part by a generative AI tool, include this disclosure in the commit message body:
+
+```text Assisted-by: AGENT_NAME:MODEL_VERSION [TOOL1] [TOOL2]``` 
+
+Also include a matching disclosure in the pull request description.

CLAUDE.md

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+@AGENTS.md

README.md

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 # rosidl_runtime_rs
 Runtime utilities for working with generated ROS interfaces in Rust
+
+## AI Policy
+Generative tools are allowed in producing contributions to its projects, with some qualifications:
+
+- Any contribution may consist, in whole or in part, of the output of one or more generative tools.
+- Any use of generative tools in a contribution must be disclosed at the time of making the contribution.
+- The disclosure must be recorded in a way that ensures it has the same or greater lifetime as the contribution itself.
+
+For source code contributions, you should add a disclosure statement in the commit message for all commits where some portion of the source code was generated.
+
+`Assisted-by: AGENT_NAME:MODEL_VERSION [TOOL1] [TOOL2]`
+
+Provide a similar disclosure statement in the PR description.
+
+See the projects [AI Policy](https://github.com/ros2-rust/ros2_rust/blob/main/docs/AI_POLICY.md) for more details.