feat: add netemu package for per-flow network emulation#30
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Adds the netemu package which uses Linux tc (HTB + netem) and iptables to enforce per-flow bandwidth and latency between replicas, configured via a declarative YAML file. Includes a runnable example targeting the bbchain cluster with LAN/WAN group profiles. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
netemupackage using Linuxtc(HTB + netem) andiptablestoenforce per-flow bandwidth, latency, and packet loss between replicas
to groups, and map group pairs to profiles
ipfield for iptables--dstwhen hostnameDNS resolution is unavailable on the nodes
runScriptnow captures stderr and includes it in error messagesTest plan
go test ./netemu/...passes