Stores a guest-VM credential into the LocalSystem keyring vault via a
transient SYSTEM scheduled task, using the production venv's keyring
(the backend ci_orchestrator reads). Fixes the per-user vault mismatch
that made act_runner (LocalSystem) fail with "Credential not found in
keyring" for cmdkey/UI-stored credentials.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Simone