Initial commit: rustytokens — native codebase indexer + MCP server

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

tests/fixtures/cppdemo/math.cpp

@@ -0,0 +1,13 @@
+#include "math.hpp"
+
+Math::Math(int scale) : scale_(scale) {
+    scale_ = scale;
+}
+
+Math::~Math() {
+    scale_ = 0;
+}
+
+int Math::add(int a, int b) { return a + b; }
+
+int Math::scaled(int v) const { return v * scale_; }