fix(v1.0.1): VDE-016 — anonymous namespace needs fully-qualified names

Root cause: GCC two-phase lookup requires fully-qualified names
when accessing enclosing namespace types from inside anonymous namespace.
Fix: add using vde::brep::SSICurveData and using vde::brep::ClassResult
inside both anonymous namespaces in ssi_boolean.cpp

src/brep/ssi_boolean.cpp

@@ -54,6 +54,9 @@ struct SSICurveData {
 };
 
 namespace {
+// GCC two-phase lookup: bring enclosing namespace types into scope
+using vde::brep::SSICurveData;
+using vde::brep::ClassResult;
 
 // ═══════════════════════════════════════════════════════════
 //  Constants & types