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/dependencies/debug.cpp

@@ -0,0 +1,46 @@
+#ifdef INTELLISENSE_DIRECTIVES
+#	pragma once
+#   include "src_start.cpp"
+#endif
+
+#pragma region Debug
+
+void assert_handler( char const* condition, char const* file, char const* function, s32 line, char const* msg, ... )
+{
+	_printf_err( "%s - %s:(%d): Assert Failure: ", file, function, line );
+
+	if ( condition )
+		_printf_err( "`%s` \n", condition );
+
+	if ( msg )
+	{
+		va_list va;
+		va_start( va, msg );
+		_printf_err_va( msg, va );
+		va_end( va );
+	}
+
+	_printf_err( "%s", "\n" );
+}
+
+s32 assert_crash( char const* condition )
+{
+	GEN_PANIC( condition );
+	return 0;
+}
+
+#if defined( GEN_SYSTEM_WINDOWS )
+	void process_exit( u32 code )
+	{
+		ExitProcess( code );
+	}
+#else
+#	include <stdlib.h>
+
+	void process_exit( u32 code )
+	{
+		exit( code );
+	}
+#endif
+
+#pragma endregion Debug