[BY-3684]: type HttpError.status as number | undefined

[svargas-dev]

Summary

HttpError.status is absent when the request never got a response, but the generated dist/index.d.ts declared it as number (tsconfig runs with strict: false, so the optional constructor param collapses to number in emitted types).

Consumers (e.g. the marketing app's surfaceError default handler) rely on a fallback chain e.status ?? e.body?.statusCode ?? 500 that only makes sense if status can genuinely be undefined.

Change

• Annotate this.status as @type {number | undefined} in lib/index.js
• Generated d.ts now emits status: number | undefined

Validation

• pnpm build: d.ts verified
• pnpm test: 74 passing
• eslint lib/index.js: clean

Refs BY-3684

[pkg-pr-new]

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npm i https://pkg.pr.new/@beyonk/http@51

commit: 3a4b341