spacedb-crdt — SpaceDB Layer 1 (convergent collections)

The default data tier, and the reason SpaceDB survives a partition-prone mesh: data is modeled as Y-CRDT (via yrs), so every write is locally available and merges conflict-free with no coordination. Writing offline on a Starlink-partitioned home is a non-event, not an error.

M2-S1 ships [CrdtDoc]: a document with a typed field→CRDT-type mapping (LWW-Register + PN-Counter), local-first mutation, and the sync primitives (state vector, incremental update, merge). The order-independent convergence property — the same updates in any order produce the same state — is proven by the fuzzed test in tests/convergence.rs.

Open-core (MIT): this depends on yrs directly, never on a MATA crate. Persistence into the encrypted spacedb-store is M2-S2.