Run adapter conformance over real Node sockets

[smiggleworth]

Summary

• adopt @askrjs/server/testing and run its shared conformance suite through real loopback sockets
• prove client abort reaches ReadableStream.cancel() through the actual response writer
• prove an incomplete chunked request receives Node's timeout termination
• initialize native timeout/checking machinery during http.Server construction for both listen() and serve()
• retain the caller-authored timeout properties, including prior mixed-value compatibility

Linked issue

Closes #23

Dependency

• Missing adapter-author guidance: stream cancellation on abort and timeout enforcement askr-server#20, released as @askrjs/server@0.0.18

TDD

• Red 1f92e83: the shared testing entry point was unavailable to the reference adapter.
• Transport red 3a3e6a5: after adopting the released runner, real response cancellation passed but an incomplete chunked body exceeded the 2-second conformance deadline despite 100 ms timeout properties.
• Green 03eaf42: request/header timeouts and a bounded checking interval are initialized at server construction; the real test passes in about 120 ms.

Guardrails

• infinite response + real HTTP client abort
• incomplete chunked body + real raw TCP client
• bounded shared diagnostics and cleanup signals
• both listen() and serve() construct servers with enforceable options
• existing direct writer, timeout property/validation, response, WebSocket, serve, and package tests remain in the same suite

Acceptance audit

• Every acceptance criterion in Adopt real-socket adapter cancellation and timeout conformance guard #23 is checked with evidence.
• Both focused red states were recorded and the shared real-socket guard is green.
• Full unit, type, build, package-artifact, audit, and exact-head hosted CI gates pass.
• Exact squash merge, tag, publish workflow, and clean registry consumer are verified.

Verification

• npm run check
• npm audit --omit=dev

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.

[smiggleworth]

Post-merge release audit: squash commit and main are b74939ddeebd937170cf4f6a6665442c268bc69c; annotated v0.0.12 peels to that exact commit. Publish run https://github.com/askrjs/askr-node/actions/runs/31907419752 succeeded across Ubuntu, macOS, and Windows. The npm registry serves @askrjs/node@0.0.12 with integrity sha512-UkVUo8D5KLes7L2cn5OKtxu9bMbQtBXVo+15wKRkzhjKcyvXqis9GTypm/GaOVX2L/CL62VvQVQzgB09iys7tg==. A clean install imported the public listen API and npm audit --omit=dev reported 0 vulnerabilities.