nx_http_form.nx

nx_http_form.nx -- application/x-www-form-urlencoded body parser. HTTP form submission per WHATWG URL §5 + RFC 1866 §8.2.1: key1=value1&key2=value2&key3=value3 Where: - `+` decodes to space - `%HH` decodes to a single byte (HH = uppercase or lowercase hex) - Other bytes pass through - Keys + values may be empty - Final `&` is tolerated Per cardinal feedback-no-third-party-trust-native-or-nothing: substrate's own parser; no querystring lib, no urlencoded-body middleware. ~250 LOC; auditable. Per cardinal feedback-privacy-by-default-no-tracking: substrate doesn't store the parsed form data anywhere; caller supplies output buffers + decides retention. nx_capability_claims: needs: [sealed_enum, byte_ops] provides: [form_urlencoded_decode, named_field_extract, pct_hex_decode, plus_to_space] safety: [no_unchecked_deref, no_floating_point, no_syscall, bounded_iteration, bit_equal_reproducible, malformed_input_rejected] verdict: [sealed_enum_5_state] license: ORIGINAL kind: racing_crew_specialist layer: L2 (transform: bytes -> decoded key=value pairs)