WIP: UPSTREAM: <carry>: add AGENTS.md for AI code contributions

[kevinrizza]

Adding AGENTS.md file for code generation tools to interact with this repository. Mostly focuses on the kinds of changes that should be made to this repo.

[openshift-ci-robot]

@kevinrizza: the contents of this pull request could not be automatically validated.

The following commits could not be validated and must be approved by a top-level approver:

• 136124e|UPSTREAM: : add AGENTS.md for AI code contributions: does not specify an upstream backport in the commit message

Comment /validate-backports to re-evaluate validity of the upstream PRs, for example when they are merged upstream.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@kevinrizza: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-ovn-techpreview-serial	136124e	link	false	/test e2e-aws-ovn-techpreview-serial
ci/prow/integration	136124e	link	true	/test integration
ci/prow/e2e-aws-ovn-serial	136124e	link	true	/test e2e-aws-ovn-serial

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