Feature walks: Repair Part has its fixture, its gap an input and its body renamed with the rest

#8676 added FeatureKind::Repair without a fixture, so
feature_walk_tests::the_record_covers_every_variant failed. The fixture sets
every field (body, gap, patch_holes); the records, written with
FEATURE_WALK_BLESS=1, show its one input (Gap, a length) and that copying with
bodies renamed rewrites its body.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/doc/src/feature_walk_tests/fixtures.rs

@@ -231,6 +231,7 @@ pub(super) fn fixtures() -> Vec<(&'static str, Value)> {
         ("import", json!({"type": "import", "file": "a.step", "step": ""})),
         ("mesh_convert", json!({"type": "mesh_convert", "body": "B", "tolerance": "mesh_convert.tolerance"})),
         ("mesh_import", json!({"type": "mesh_import", "file": "a.stl", "meshes": []})),
+        ("repair", json!({"type": "repair", "body": "B", "gap": "repair.gap", "patch_holes": true})),
     ]
 }
 

crates/doc/src/feature_walk_tests/golden_exprs.txt

@@ -428,3 +428,7 @@ mesh_convert
     Tolerance = mesh_convert.tolerance (Length)
   expressions: mesh_convert.tolerance
 mesh_import
+repair
+  inputs:
+    Gap = repair.gap (Length)
+  expressions: repair.gap

crates/doc/src/feature_walk_tests/golden_geometry.txt

@@ -207,3 +207,4 @@ move
 import
 mesh_convert
 mesh_import
+repair

crates/doc/src/feature_walk_tests/golden_refs.txt

@@ -238,3 +238,5 @@ import
 mesh_convert
   remap_bodies: body
 mesh_import
+repair
+  remap_bodies: body