Initial commit: rustytokens — native codebase indexer + MCP server

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

tests/fixtures/javademo/Util.java

@@ -0,0 +1,5 @@
+package demo;
+
+public class Util {
+    public static int helper() { return 42; }
+}