Route the s3 backend through StorageBackendFactory::parseURL so scheme
detection, authority credentials, and query params flow through the same
path as the daemon's storage resolver, and reject a backend=s3 config
whose path is not an s3:// URL.
Thin p2p command over the memory-sync service: publish <key> <value|@file>,
read <key>, and status (merged index summary + backend identity). Binary
values are hex-encoded in JSON output; config resolves from [memory_sync]
with --backend/--path/--node-id overrides.
Typed MemorySyncDaemonConfig parsed from the [memory_sync] TOML section
(enabled, node_id, backend, path, sync_interval_ms) plus
createMemorySyncService() which resolves filesystem/s3 backends and
constructs the service. No YAMS_* env knobs.
Daemon-facing service owns the backend + sync loop and reconciles on a
configurable interval via a stoppable worker thread. Typed
MemorySyncConfig (nodeId, syncIntervalMs); start/stop idempotent and
stop noexcept-safe. Backend injected so filesystem and S3/R2 resolution
stay with the caller.
Publish memory records as content-addressed blobs plus a
version-vector-tagged index record per write; sync lists the index,
pulls records, and LWW-merges to a deterministic winner per logical
key. Backend injected (filesystem / S3-R2 interchangeable).
Version vector (element-wise max merge, dominates/concurrent partial
order) plus hybrid timestamp and LWW resolution: causally-later writes
win, concurrent writes resolve deterministically by (ts, origin). JSON
serialization via nlohmann. Header-only, no library deps.
