Extend C-328 to the full-response http family on the stock WASI 0.3 component

[O6lvl4]

Refs almide/almide#1710 (ADR-0023 step 4)

ADR-0023 step 4 serves the six *_response functions in the p3 shim over wasi:http. This is the route the ADR chose; als#131 described a host-op route, which als#132 withdrew.

Changes

• New clause in C-328: on native and the stock WASI 0.3 component, these read the same: the status, get_header, every value of a repeated field in order, the lowercased header set, the body, and a failure's text.
• The NATIVE-ONLY sentence now holds for the embedded and stock-p1 lanes only. The embedded lane gets the family at ADR-0023 step 7.
• The empty-body framing fix: the p3 shim sends content-length: 0 unless the method is GET or HEAD. Without it, the host framed an empty PATCH or DELETE as chunked 0\r\n\r\n where native sends no content.

Evidence

• The implementation's tests/http_response_cross_test.rs runs every verb plus a plain empty PATCH against a loopback server. It requires identical stdout and exit codes from native and from wasmtime run -S http=y on the component.
• That test will be cited in the implementation's ledger when it lands, not here, per the boundary rule.
• Gates run locally: contracts, provenance, style, links, gate verification, the conformance self-test.

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