* fix(http): enforce HTTP/1.1 Host requirement
- Enforce Node's default Host behavior while preserving opt-out and HTTP/1.0 handling.
- Match the 400 wire response and add C/LLVM differential coverage.
* feat(http): add static HTTP trailer and streaming support
- Parse incoming chunk trailers and expose distinct/raw trailer reads.
- Frame outgoing trailers and add streaming controls with differential coverage.
* fix(http): harden request trailer parsing
- Safely discard trailers after early responses while preserving parser validation.
- Bound aggregate head and trailer parsing by bytes and field count.
- Add regressions for early response trailers and overflow rejection.
