chore: Add AGENTS.md

[alanconway]

Generated by Claude Code using the '/init' command, and renamed to AGENTS.md
Keep a CLAUDE.md symlink since Claude doesn't yet support AGENTS.md.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alanconway

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[openshift-ci]

@alanconway: The following test 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/unit	9cdab5e	link	true	/test unit

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