Phase 6.3: TCP window management — track guest window, advertise host kernel rcv-space#79

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dpsoft wants to merge 11 commits intomainfrom

phase6.3-window-mgmt-rebased

Commits on May 6, 2026

docs: Phase 6.3 detailed TDD plan — TCP window management
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feat(slirp): TcpNatEntry tracks guest_window + guest_window_scale
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feat(slirp): parse guest's window_scale on SYN, store on flow
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feat(slirp): track guest's advertised window on every incoming frame
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refactor(slirp): build_tcp_packet_static takes (window_len, window_scale)
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feat(slirp): advertise host-kernel-derived window on outgoing frames
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test(network): pin tcp_advertised_window_tracks_guest_buffer (BROKEN_ON_PURPOSE)
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feat(slirp): gate host→guest send on guest's advertised window
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test(network): pin tcp_window_scale_negotiated_in_synack
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bench(network): tcp_bulk_throughput_constrained_window parametric
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perf(slirp): cache host_recv_window per-flow with 5ms TTL
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