The per-group cap of 5 models was enforced in three client-side locations with no server-side constraint and no technical justification; the store iterates models in a plain loop and dispatches each run via Promise.allSettled. Remove the cap entirely from MultiRunLauncher, useMultiRunStore, and AgentManagerEmptyState, and drop the {max} ceiling from the launcher info copy across all locales.
Closes #2847