Initial commit: rustytokens — native codebase indexer + MCP server

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

tests/fixtures/javademo/Dead.java

@@ -0,0 +1,5 @@
+package demo;
+
+public class Dead {
+    public static void unused() {}
+}

tests/fixtures/javademo/Main.java

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+package demo;
+
+import demo.Util;
+
+public class Main {
+    private final int seed;
+
+    public Main(int seed) {
+        this.seed = seed;
+    }
+
+    public static void main(String[] args) {
+        System.out.println(Util.helper());
+    }
+}

tests/fixtures/javademo/Util.java

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+package demo;
+
+public class Util {
+    public static int helper() { return 42; }
+}