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Jinwoo-HandOrca
1f768d3dbe
The multiplex output path silently drops Output frames when the websocket buffer exceeds MAX_BINARY_BUFFERED_AMOUNT (encryptedBinaryReply returns false). The client never noticed the gap, so a congested link (fast PTY over slow/SSH transport) permanently corrupted the remote terminal with missing/garbled output and no error. Output frame seq is a byte high-water, so a drop is self-describing on the wire. The client now tracks the expected next offset and, on a gap, discards the corrupt tail and pulls a fresh authoritative snapshot (self-healing, no user-facing error). Server-side, seq-less Output chunks now carry the sentinel 0 instead of the control-frame cursor so they don't poison the client's gap detector, and sendFrame propagates the send/drop result end-to-end. Adds an end-to-end repro test driving the real client multiplexer through a fake backpressured transport. Co-authored-by: Orca <help@stably.ai>