Document the new DPF surfaces in one command set, and test the field, half-tree, and multipoint edges.

Co-authored-by: Cursor <cursoragent@cursor.com>

test/tests/corner_gaps_test.cpp

@@ -384,7 +384,10 @@ TEST(CornerGaps, PrgRejectsUint32Seam)
         EXPECT_EQ(std::memcmp(&out[i], &one, sizeof(one)), 0) << i;
     }
 
+    HEDLEY_PRAGMA(GCC diagnostic push)
+    HEDLEY_PRAGMA(GCC diagnostic ignored "-Wignored-attributes")
     EXPECT_THROW((dpf::randomness::detail::lane_codec<dpf::prg::aes128, simde__m128i>::fill(
         seed, static_cast<std::uint64_t>(UINT32_MAX) - 1u, out, 4)),
         std::invalid_argument);
+    HEDLEY_PRAGMA(GCC diagnostic pop)
 }