test(gencpp): add full gencpp/base samples and comprehensive test suite

- Copied 58 files from C:\projects\gencpp\base\ to tests/assets/gencpp_samples
- Added test_gencpp_full_suite.py that validates:
  - Skeleton generation for all .hpp files
  - Code outline generation
  - get_definition for key symbols
  - AST masking with aggregation
- All 25 tests pass

tests/assets/gencpp_samples/auxiliary/gen_template.hpp

@@ -0,0 +1,35 @@
+#ifdef INTELLISENSE_DIRECTIVES
+#	pragma once
+#	include "helpers/push_ignores.inline.hpp"
+#	include "components/header_start.hpp"
+#	include "components/types.hpp"
+#	include "components/gen/ecode.hpp"
+#	include "components/gen/eoperator.hpp"
+#	include "components/gen/especifier.hpp"
+#	include "components/ast.hpp"
+#	include "components/code_types.hpp"
+#	include "components/ast_types.hpp"
+#	include "components/interface.hpp"
+#	include "components/inlines.hpp"
+#	include "components/gen/ast_inlines.hpp"
+#	include "components/header_end.hpp"
+#endif
+
+/*
+	Explicitly generates a resolved definition of a cpp template definition.
+
+	TODO(Ed): Needs implementing for the C-library variant.
+	TODO(Ed): We need a non <token> syntax subst implemtnation for Strings for this to work. It must subst keywords directly based on template parameter names.
+
+	This is only meant to be used on relatively trivial templates, where the type or numeric is mostly a 'duck' type.
+	It cannot parse complex template parameters.
+
+	The varadic args should correspond 1:1 with the type of objects the generator expects from the template's parameters.alignas.
+*/
+
+CodeOperator gen_operator_template( CodeTemplate template, ... );
+CodeFn       gen_func_template( CodeTemplate template, ...  );
+Code         gen_class_struct_template( CodeTemplate template, ... );
+
+Code gen_template( CodeTemplate template, ... );
+Code gen_template( Str template, Str instantiation );