test(http): expand http_parser.cpp coverage with 112 cases (#1014)

Covers branches not reached by the existing http_parser_test suite: URL
encode/decode edge cases (percent truncation, lowercase hex, high-bit
bytes), query string delimiter handling (leading/trailing '&',
double '&', duplicate keys, URL-encoded delimiters), cookie
malformed-pair handling, parse_request_line / parse_status_line error
branches, parse_headers edge cases (multi-colon, empty value),
multipart form-data edge cases (missing Content-Disposition, quoted
boundary, empty field), chunked encoding boundary conditions (empty
body, exact-chunk-size, multi-chunk, lowercase Content-Length
removal, HTTP/1.0 fallback), byte-vector vs string_view parse parity,
binary body preservation, and round-trip invariants.

Follows the same pattern as tests/unit/hpack_coverage_test.cpp (#1009)
and tests/unit/quic_frame_coverage_test.cpp (#1011). Static symbol
verification in lieu of local build (CMake/ninja/compiler unavailable
in this environment).

Part of #953.

Closes #1013

Author: kcenon

tests/CMakeLists.txt

@@ -4703,6 +4703,14 @@ add_network_test(network_http2_client_coverage_test unit/http2_client_coverage_t
 add_network_test(network_http2_client_extended_coverage_test
                  unit/http2_client_extended_coverage_test.cpp)
 
+# HTTP parser extended coverage: url_encode/decode edge cases (percent
+# truncation, high-bit bytes, hex case), query string delimiter handling
+# (leading/trailing '&', duplicate keys, URL-encoded delimiters), cookie
+# malformed-pair handling, parse_request_line / parse_status_line error
+# branches, multipart form-data edge cases, chunked encoding boundary
+# conditions (Issue #1013)
+add_network_test(network_http_parser_coverage_test unit/http_parser_coverage_test.cpp)
+
 # Secure transport module tests
 add_network_test(network_secure_tcp_socket_module_test unit/secure_tcp_socket_test.cpp)
 # secure_messaging_udp_client/server excluded: depend on dtls_socket from