Update the ATVM git instructions so controller-repo git drafting and the SSH-prefixed push example only apply when the operator explicitly asks for the e2e cypress repo or a close variation.
Align AGENTS.md with git-guide.md so generic ATVM git requests no longer assume the controller repo by default.
Update the ATVM git guide so push examples do not hardcode origin/main.
Prefer the operator-specified remote and branch when provided, and otherwise draft a generic SSH-prefixed git push command or use the remote/branch already established in context.
Prefer failing and terminal host results when merging supplemental
subrun artifacts so a later partial artifact cannot overwrite a more
authoritative outcome.
Also point ATVM agent guidance at the ATVM-specific git guide and add
that guide to document draft-only commit handling and the default SSH
command pattern.
