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/builder.cpp

@@ -0,0 +1,61 @@
+#ifdef INTELLISENSE_DIRECTIVES
+#	include "builder.hpp"
+#endif
+
+#pragma region Builder
+
+Builder builder_open( char const* path )
+{
+	Builder result;
+
+	FileError error = file_open_mode( & result.File, EFileMode_WRITE, path );
+	if ( error != EFileError_NONE )
+	{
+		log_failure( "gen::File::open - Could not open file: %s", path);
+		return result;
+	}
+
+	Context* ctx = get_context();
+	GEN_ASSERT_NOT_NULL(ctx);
+	result.Buffer = strbuilder_make_reserve( ctx->Allocator_Temp, ctx->InitSize_BuilderBuffer );
+
+	// log_fmt("$Builder - Opened file: %s\n", result.File.filename );
+	return result;
+}
+
+void builder_pad_lines( Builder* builder, s32 num )
+{
+	strbuilder_append_str( & builder->Buffer, txt("\n") );
+}
+
+void builder_print( Builder* builder, Code code )
+{
+	StrBuilder   str = code_to_strbuilder(code);
+	// const ssize len = str.length();
+	// log_fmt( "%s - print: %.*s\n", File.filename, len > 80 ? 80 : len, str.Data );
+	strbuilder_append_string( & builder->Buffer, str );
+}
+
+void builder_print_fmt_va( Builder* builder, char const* fmt, va_list va )
+{
+	ssize   res;
+	char buf[ GEN_PRINTF_MAXLEN ] = { 0 };
+
+	res = c_str_fmt_va( buf, count_of( buf ) - 1, fmt, va ) - 1;
+
+	strbuilder_append_c_str_len( (StrBuilder*) & (builder->Buffer), (char const*)buf, res);
+}
+
+void builder_write(Builder* builder)
+{
+	b32 result = file_write( & builder->File, builder->Buffer, strbuilder_length(builder->Buffer) );
+
+	if ( result == false )
+		log_failure("gen::File::write - Failed to write to file: %s\n", file_name( & builder->File ) );
+
+	log_fmt( "Generated: %s\n", builder->File.filename );
+	file_close( & builder->File );
+	strbuilder_free(& builder->Buffer);
+}
+
+#pragma endregion Builder