[vxfemboy]

Summary of Changes

1. Windowed Per-Class Loss Denominator (bin/yipd/src/dataplane.rs, Data-plane follow-ups & investigations (umbrella) #11):

   • Replaced historical sent_log total buffer residency denominator with exact windowed sequence ranges $(H_{\text{prev}}..H_{\text{curr}}]$ via SentLog::count_classes_in_range.
   • In DataPlane::on_udp_datagram, tracked last_loss_report_high: u64 to evaluate class loss fractions only over packets newly covered by the feedback report ({\text{class}} = M_{\text{class}} / S_{\text{class}}$), eliminating dilution/over-repair caused by long-resident inactive packets in the 4,096-packet buffer history.
   • Preserved safe handling for zero-sample classes without triggering false ratio decay or blackhole fallbacks.

2. Loss-Detector Partial-Receive Hardening & Window Alignment (crates/yip-transport/src/lossdetect.rs, bin/yipd/src/dataplane.rs, Data-plane follow-ups & investigations (umbrella) #11):

   • Aligned LossDetector window bound to 4,096 entries (matching SENT_LOG_CAPACITY), preventing premature watermark and resolved_set eviction while packets remain live in the sender's retx buffer.
   • Formally documented the multi-symbol partial-receive lifecycle: unrecovered multi-symbol objects promote to missing after grace_ms, mark resolved, trigger repair from retx, and decode on on_delivered.
   • Verified the extreme-reordering invariant in dataplane.rs: late spurious NACKs arising from counters evicted far above the watermark are dropped silently by the bounded RetxBuffer with zero side-effects.

3. 1000-Ping Variance Tightening & Benchmark Suite Polish (crates/yip-bench/, Data-plane follow-ups & investigations (umbrella) #11):

   • Parameterized run-compare.sh, run-iperf-compare.sh, and run-wan-bench.sh for configurable PING_COUNT and PING_INTERVAL, auto-defaulting to -i 0.005 (5ms) when PING_COUNT >= 1000.
   • Updated loss percentage regex parsers across all scripts to capture fractional percentages (([0-9.]+)%), tightening netem loss resolution to $\pm 0.1%$.
   • Documented the comparative VPN & mesh contender matrix (WireGuard, OpenVPN, n2n, ZeroTier, AmneziaWG) in crates/yip-bench/README.md.

4. Roadmap & Changelog:

   • Updated ROADMAP.md and CHANGELOG.md.

Closes #11.