Why:
RpcFrameEncoder serializes normal frames once for protocol routing and again
for output, while v2 snapshots serialize message payloads separately.
Changes:
- Feed the existing JSON into frame-size enforcement.
- Build v2 message snapshots from the serialized frame.
Evidence:
- End-to-end paired medians improved 10.72% for v1 and 15.72% for v2
across 25 pairs, with identical output hashes.
Refs #8118
Bonobo
9de7862a29