fix(examples): car-mirror-symmetry asset sheet against the new reference set

Adds the car's SELECT row to scripts/asset_sheet.py (body, wheels and the
fitted parts; stage excluded) and regenerates the asset sheet with the
committed tool against the reference set pinned in CLAUDE.md after #257:
collision-hull-proxy, socket-attach-points, vertex-color-ao, wheelbarrow,
apothecary-shelf. The old-car panel from the scratch sheet is dropped.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Signed-off-by: TMHSDigital <154358121+TMHSDigital@users.noreply.github.com>

Author: TMHSDigital

docs/gallery/asset-sheets/car-mirror-symmetry.webp

@@ -65,6 +65,8 @@
     "grain-sacks": (r"^SacksLow$", None),
     "rope-bridge": (r"^BridgeLow$", None),
     "wheelbarrow": (r"^BarrowLow$", None),
+    "car-mirror-symmetry": (r"^(CarBody|Wheel(Front|Rear)|Headlamp|Taillamp|Grille"
+                            r"|DoorMirror|DoorHandle(Front|Rear))$", None),
 }
 
 _REF_LINE = re.compile(r"Asset-sheet gate.*?reference set — currently (.+?) — rendered", re.S)