(1) Spanner does exist, though not really available outside of Google
For another it would be really weird for Spanner to expose something CRDT shaped since Spanner is a strongly-consistent distributed database which depends heavily on global order and read/write locks driven by meticulously coordinated multi-site global wall-clock time and consensus groups.
In some ways it's almost the opposite of what I want... with exception of the fact that it's also distributed. I want extreme availability with lazy, weak coordination.
No, it's slightly more lazy in that that. It does timestamp coordination, but retrospectively.