Ported only the dual-stack listen from PR #291 (the change accepted as #188). With HOST unset the server binds :: and, if that fails with EAFNOSUPPORT, EADDRNOTAVAIL or EINVAL, retries 0.0.0.0. An explicit HOST, including 0.0.0.0 and 127.0.0.1, is tried once. The boot banner and doctor list shareable IPv6 addresses in brackets, skip fe80::, and keep one URL per /64. An explicit IPv6 literal in the local URL is bracketed. The Windows service listing no longer drops those bracketed lines.
Not ported: /dev/grant, the settings-default migration, and the firewall scripts. The Docker image stays on 0.0.0.0; the alpine fallback was not booted.
Tests: node --test test/ipv6-bind.test.js test/doctor.test.js test/ci.test.js — 20 pass, 0 fail (8 bind, 4 doctor, 8 ci).
Applied as-is. tools/ci.mjs runs the checks already listed in .github/workflows/ci.yml, in that order, and skips checkout, setup-node and npm ci. Children are spawned with process.execPath, not a shell. test/ci.test.js keeps the step list, smoke script, job env and package.json scripts in step with the workflow.
Tests: node --test test/ci.test.js — 8 pass, 0 fail. npm run ci was not run (it installs and runs the suite).
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