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/components/src_start.cpp

@@ -0,0 +1,11 @@
+#if ! defined(GEN_DONT_ENFORCE_GEN_TIME_GUARD) && ! defined(GEN_TIME)
+#	error Gen.hpp : GEN_TIME not defined
+#endif
+
+#include "gen.hpp"
+
+//! If its desired to roll your own dependencies, define GEN_ROLL_OWN_DEPENDENCIES before including this file.
+//! Dependencies are derived from the c-zpl library: https://github.com/zpl-c/zpl
+#ifndef GEN_ROLL_OWN_DEPENDENCIES
+#	include "gen.dep.cpp"
+#endif