Function encode_delta_snapshot_for_client 

pub fn encode_delta_snapshot_for_client(
    schema: &Schema,
    tick: SnapshotTick,
    baseline_tick: SnapshotTick,
    baseline: &Snapshot,
    current: &Snapshot,
    limits: &CodecLimits,
    out: &mut [u8],
) -> CodecResult<usize>

Encodes a delta snapshot for a client-specific view.

This assumes baseline and current are already filtered for the client interest set. Updates are encoded in sparse mode to optimize for small per-client packets.