Prefer workplan_id in State Hub progress writes while dual-writing
workstream_id for wire-compat. Extend schedule_health, evidence/report
sinks, phase5 checks, k8s triage prose, and SCOPE terminology.
Add phase5_stabilization_check State Hub resolver with progress evidence
sinks, schedule projections for daily and closeout checks, custodian:// and
activity-core:// runtime path resolution, and Railiance mounts under /var/custodian.