The stateful HTTP handler hardcoded body = b"", so request bodies never
reached handle_request. In WASIp3 the body is a stream<u8> obtained via the
static request.consume-body; read it (consume_body moves the request, so
method/uri/headers are read first) and drain the stream to bytes until the
writer end closes, mirroring componentize-py's http-p3 example. The unit
res-future constructor is discovered on the world module (the error_code
future without "fields"). Requires componentize-py with WASI 0.3 support
(bytecodealliance/componentize-py#225). py_compile + inspection verified;
not runtime-tested here.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>