Compose collapse — single canonical multi-cluster strata service; legacy single-cluster + features sidecars removed; new lab-cassandra-3 profile for multi-replica HA validation.
Drain progress physical chunks — /drain-progress gains three additive fields (physical_chunks_on_cluster, physical_bytes_on_cluster, gc_queue_pending); UI surfaces physical RADOS count as primary with a 3-state machine; back-compat fallback for memory + S3 backends.
TiKV-default lab — bare docker compose up -d flips from a single Cassandra-backed strata to a 2-replica TiKV-backed lab behind nginx LB on :9999; Cassandra-backed shape moves under make up-cassandra (= --profile cassandra up -d) on :9998; retired profiles (tikv, lab-tikv, lab-tikv-3, lab-cassandra-3) drop; 3-replica TiKV bench parked as P3 follow-up.