HF RL Explorer

Realtime Client: Add V2 Serializer Support for Binary Payloads and User Broadcast Push

Realtime Client: Add V2 Serializer Support for Binary Payloads and User Broadcast Push: a task in LegoFlow-SWE (Harbor dataset). Common header (all message types) - First byte: message type - 0 → regular push - 3 → user‑broadcast‑push - Subsequent bytes encode the lengths and values of join ref …

The task

**Common header (all message types)** - First byte: message type - `0` → regular push - `3` → user‑broadcast‑push - Subsequent bytes encode the lengths and values of `join_ref`, `ref`, `topic`, and `event` as follows: - 1‑byte length if the string length < 128, otherwise 2‑byte length (big‑endian). - The string bytes…

Part of Lego-X/LegoFlow-SWE.