wip(ext/node): HTTPParser cppgc binding skeleton
Work-in-progress cppgc binding for the llhttp-based HTTPParser.
Architecture:
- C callbacks store data in ExecuteContext via llhttp_t.data
- execute() stores PinScope pointer for JS callback invocation
- on_headers_complete passes args matching Node.js format
- Header accumulation with flush at MAX_HEADER_PAIRS (32)
Not yet compiling — needs interior mutability refactor (&self
vs &mut self for cppgc ops) and v8 scope lifetime fixes.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
