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.

[alanconway]

/cc @jcantrill

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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[jcantrill]

/hold

[jcantrill]

@alanconway do you think it is sufficient to add this file to this branch? This is only a reference branch at the moment and we work off the versioned branches. Maybe it makes more sense to add the change to the latest ? 0.47? I defer to you here

[alanconway]

@jcantrill honestly not sure. Should it be in upstream vector?

[jcantrill]

@alanconway the question context was not for "upstream" vector but whether there should be an agent file for the RH branches of vector in this repo which are created from the upstream tags. This PR is against 'main' which has no code meaning it may have limited value here.

[alanconway]

Changed target branch, see : https://github.com/ViaQ/vector/pull/242  and #243