Add llhttp gem

[hakanensari]

Summary

• Adds minimal RBS stubs for the llhttp gem at gems/llhttp/0.6/.
• Sibling to Add llhttp-ffi gem #1030 (llhttp-ffi): the http gem 6.x's gemspec runtime-depends on llhttp (~> 0.6.1), not llhttp-ffi, so most consumers of http's RBS need this one to satisfy Cannot find type \LLHttp::Delegate`errors raised fromgems/http/.../sig/http.rbs`.
• The two gems expose an identical public LLHttp namespace, so the stub here is verbatim what was merged in Add llhttp-ffi gem #1030.

Stub surface

Intentionally minimal — limited to what gems/http/.../sig/http.rbs references (LLHttp::Delegate, LLHttp::Parser, plus the parser methods Response::Parser calls). Not an attempt to type the whole gem.

Test plan

• bin/test gems/llhttp/0.6 passes (rbs validate, steep check, untyped-call check).

[github-actions]

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See also: https://github.com/ruby/gem_rbs_collection/blob/main/docs/CONTRIBUTING.md

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llhttp

This RBS files are newly added.

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[hakanensari]

/merge

[Copilot]

Pull request overview

Adds minimal RBS stubs for the llhttp gem (v0.6), intended to provide the LLHttp namespace surface needed by downstream signatures.

Changes:

• Add gems/llhttp/0.6/llhttp.rbs with minimal definitions for LLHttp::Parser, LLHttp::Delegate, and LLHttp::Error.
• Add a smoke test under gems/llhttp/0.6/_test/test.rb exercising the stubbed API.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
gems/llhttp/0.6/llhttp.rbs	Introduces minimal LLHttp RBS surface (Parser, Delegate, Error).
gems/llhttp/0.6/_test/test.rb	Adds a basic runtime usage test to validate the exposed surface.

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[Copilot]

PR description references gems/http/.../sig/http.rbs (and http 6.x) as the consumer of these stubs, but in this repo gems/http currently only contains 5.1/http.rbs and there are no LLHttp references under gems/http. Consider updating the PR description to clarify that this stub is intended to satisfy the upstream http gem 6.x bundled signatures (not present in this repo), or add/update the corresponding gems/http entry if that was the intent.