fix(v1.0.1): VDE-016 — using declarations at vde::brep scope, not inside anonymous ns

Root cause: using declarations inside anonymous namespace don't propagate
to public functions defined after the anonymous namespace closes.

Fix:
- using SSICurveData; and using ClassResult; at vde::brep scope
- Remove self-referencing using vde::brep::ClassResult
- Remove duplicate using from inside anonymous namespace

docs/feedback/VDE-016.md

@@ -1,6 +1,6 @@
 ---
 id: VDE-016
-status: open
+status: fixed
 severity: critical
 category: bug
 date: 2026-07-27