Port Remix serve and Node HTTP Server prototype corpus

Track the contiguous Bun corpus blocker at js/third_party/remix/remix.test.ts (position 4047).

Required parity:

• export a genuine node:http Server constructor whose prototype can be patched by ecosystem packages;
• preserve createServer(), listen(), address(), request, and streamed response behavior through Home's in-memory HTTP transport;
• validate and serve the copied compiled Remix server entry through the @remix-run/serve CLI lifecycle;
• retain causal, operation-specific startup diagnostics without leaking application source or environment values;
• add the case and its diagnostic contract to the permanent third-party regression suite.

Implemented and pushed in https://github.com/home-lang/home/commit/932ee05e3.

The port now:

• exports a genuine node:http Server constructor and routes createServer() instances through its patchable prototype;
• preserves the existing in-memory listen/address/request/response transport used by the corpus;
• provides the @remix-run/serve/dist/cli.js startup lifecycle, validates the copied compiled server entry, and serves its expected Remix route output;
• reports startup failures as RemixServeError with stable ERR_REMIX_SERVE, remix.serve.start, entry and retained cause metadata, plus an explicit causal operation stack without embedding application source or environment values;
• permanently re-runs the copied Remix test and the dedicated error-contract diagnostic.

Verification:

• focused position 4047: 1 file, 1 passed, 0 failed/todo/unsupported/allowed-empty;
• positions 4046–4047: 2 files, 2 passed, 0 failed/todo/unsupported/allowed-empty;
• permanent gRPC error-stack, SQL adapter-contract, and 30-case third-party diagnostic suites all pass.