Development Update — August 28

Forward error correction lands in the packet mux. Of the three named escapes from the in-order-stream wall, FEC is the first to ship: repair packets ride alongside data so a lost packet on one leg is reconstructed at the far end instead of stalling the reorder frontier until retransmit. Alongside it, retransmit timing itself gets modern — a RACK-derived threshold replaces the fixed timer — and the two ends of a route group start telling each other which legs are active.

Skywire: Forward Error Correction

4278 contributes the coding core — a systematic Cauchy-Reed-Solomon erasure code — and 4282 wires it into the packet mux as negotiated, per-group FEC. 4284 passes the symbol length through the repair-packet send/receive path, and 4297 fixes routing so RepairPacket is actually forwarded at every hop rather than dropped at the first intermediary. 4292 adds the telemetry — repair bytes and reconstruct counts in visor state — to see it earn its overhead. 4285 and 4286 write the design down: the reorder buffer never releases or skips a gap, and the three escapes from the in-order-stream wall are FEC, scheduling, and range-splitting.

Skywire: Retransmit on Evidence, Not a Timer

4295 replaces the fixed 750ms retransmit threshold with a RACK-derived one — a packet is declared lost relative to the most recently acknowledged send, scaled by measured RTT. 4299 adds the tail-loss probe for losses no later packet can expose, and DSACK-driven adaptation of the reorder window so spurious retransmits teach the sender patience.

Skywire: Leg Guards, Both Directions

The leg-lifecycle work continues: 4262 sheds a goodput-black-hole leg even when the frontier looks healthy, 4280 reaps and replaces a black-holing sole leg, 4264 dynamically re-elects the primary when it falls out of band, 4265 parks rather than removes stalled legs in manual mode, and 4263 tightens the active-latency band in capacity mode. 4272 and 4273 make the band read a fast-clustered, transport-RTT-backed latency rather than raw EWMA, and 4275 goodput-gates the band demotion so a carrying leg is not demoted on latency alone. 4300 and 4302 introduce CapLegState — each side signals a leg’s standby/active transitions, and its born-standby state, to the peer — and 4303 adds a per-leg unique-payload counter for confound-free per-direction telemetry. 4261 gates proxy switch on leg-alive rather than non-standby.

Skywire: In the Browser

4279 adds an optional Go/wasm transport worker for browse origins — off by default, deliberately: the JavaScript worker’s security property is that a hundred auditable lines on the untrusted origin name no transport, and the wasm variant exists to test that implementation, failing closed where the role is absent. 4293 raises the nested-browser window when its content is clicked, and 4296 fast-rewarms the in-tab proxy when a suspended tab wakes.

Skywire: CLI, Pty and the Rest

4266 streams pty exec output over HTTP instead of buffering it against a 16MiB cap. 4267 stops truncating public keys in logs and CLI output. 4281 adds --direct to proxy start, 4283 reports /health transport stats for all transport types rather than a hardcoded few, and 4294 draws the mux route tree on the manager UI’s node Routing tab. 4268, 4274 and 4276 cover dependency, lint and log-tag housekeeping.