Class-A surfacing 2/3: surface match, boundary patch and CV fairing (#1487)

Thanks @midasdf.

crates/doc/src/feature_walk_tests/fixtures.rs

@@ -161,6 +161,11 @@ pub(super) fn fixtures() -> Vec<(&'static str, Value)> {
         ("surface_loft", json!({"type": "surface_loft", "sections": []})),
         ("surface_blend", json!({"type": "surface_blend", "from": {"body": "B", "edges": [o]}, "to": {"body": "C", "edges": [o]}, "align": [o, o]})),
         ("surface_offset", json!({"type": "surface_offset", "faces": [o], "distance": "soff.distance", "tolerance": "soff.tolerance"})),
+        // The Class-A surface family (surface.blend/boundary/match/fair).
+        ("surface_blend", json!({"type": "surface_blend", "from": {"body": "B", "edges": [o]}, "to": {"body": "C", "edges": [o]}, "align": [o, o]})),
+        ("surface_boundary", json!({"type": "surface_boundary", "sketch": 1, "curves": ["l1", "l2"]})),
+        ("surface_match", json!({"type": "surface_match", "body": "B", "faces": [o], "target": "C", "edges": [o]})),
+        ("surface_fair", json!({"type": "surface_fair", "body": "B", "faces": [o], "tolerance": "sfair.tolerance"})),
         ("unstitch", json!({"type": "unstitch", "body": "B"})),
         ("reverse_normal", json!({"type": "reverse_normal", "body": "B"})),
         ("surface_untrim", json!({"type": "surface_untrim", "face": {"body": "B", "point": o}, "holes": [o], "outer": true})),