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Johnathan Corgan 19efe06622 Add dest_coords to SessionAck for return-path routing

SessionAck previously only carried the responder's coordinates
(src_coords). When the return path diverged from the forward path
(e.g., after tree reconvergence), transit nodes on the return path
lacked the initiator's coordinates and couldn't route the SessionAck
back, causing handshake timeouts.

Add dest_coords (initiator's coordinates) to the SessionAck wire
format, mirroring SessionSetup's design. Transit nodes now cache both
endpoints' coordinates when forwarding a SessionAck, making the return
path self-sufficient regardless of path asymmetry.

Root cause confirmed by churn-20 sim log analysis: the n04-n14
handshake failure was caused by n15 (return-path transit) lacking
n04's coordinates, not by stale tree routes through a downed node.

2026-02-21 14:18:48 +00:00

benches

Bloom module test coverage, benchmarks, and design doc corrections

2026-02-15 16:05:59 +00:00

docs

Add dest_coords to SessionAck for return-path routing

2026-02-21 14:18:48 +00:00

src

Add dest_coords to SessionAck for return-path routing

2026-02-21 14:18:48 +00:00

testing

Update design docs for heartbeat, auto-reconnect, handshake retry, and sim improvements