OPEN and OPEN_ACK now carry proto:1 alongside upstream_id:1. The
session is tagged with its transport proto and reliability semantics
switch on the specific proto:
- TCP (proto=1): full L2 reliability (seq, ack, retransmit, in-order)
- UDP (proto=2, reserved): best-effort (no retransmit, no ordering,
no pure ACKs — seq/ack_seq fields present but ignored)
This is architecturally correct: instead of a generic 'reliable:bool'
flag, each proto gets the semantics it needs. Today only TCP exists so
every session is reliable, but the extension point is clean for when
stateless protos are added.
Updated: PROTOCOL.md, Rust frame.rs/session.rs/main.rs,
C# Frame.cs/SessionManager.cs.
mute
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