dave
8bdaabd06c
refactor: split crdt_sync.rs into auth/wire/server/dispatch/client modules
The 3672-line crdt_sync.rs is split into a sub-module directory with
co-located tests per Rust convention:
- auth.rs: trusted-keys + bearer-token validation (230 lines)
- wire.rs: ChallengeMessage / AuthMessage / SyncMessage types (141 lines)
- server.rs: WebSocket server handler (1680 lines)
- dispatch.rs: incoming-message dispatch + bulk/clock/op handling (1028 lines)
- client.rs: rendezvous client + reconnect/backoff (464 lines)
- mod.rs: doc, cross-cutting constants, re-exports (75 lines)
No behaviour change. All 65 crdt_sync tests pass; full suite green
(2635 tests with --test-threads=1).