Function replicate_injected_projection_for_local_foundation 

pub fn replicate_injected_projection_for_local_foundation(
    source_root: &Path,
    target_root: &Path,
    reference: &InjectedSecretReference,
) -> Result<(), LocalInjectedSecretReplicationError>

Replicates one immutable Local foundation projection into another workload root without returning its material to the caller. An existing valid target is retained, making the additive migration safe to rerun.