Capability Progression

A recommended order — each step builds on the prior and is independently testable:

AUDIT
  → SUPERSESSION_CHAIN
  → BI_TEMPORAL
  → HARD_DELETE
  → MULTI_TENANT
  → CONFLICT_DETECTION
  → CROSS_SESSION_PROPAGATION
  → PROVENANCE
  → CRYPTOGRAPHIC_PROVENANCE
  → (ConcurrentMemoryBackend: concurrency control)

Stop wherever your backend's guarantees honestly end. A store that conforms on {AUDIT, SUPERSESSION_CHAIN, BI_TEMPORAL} is a perfectly valid GMP backend.