Initial commit: rustytokens — native codebase indexer + MCP server

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

tests/fixtures/rustdemo/src/dead.rs

@@ -0,0 +1 @@
+pub fn totally_dead() {}

tests/fixtures/rustdemo/src/lib.rs

@@ -0,0 +1,5 @@
+pub mod util;
+
+pub fn add(a: i32, b: i32) -> i32 {
+    a + b
+}

tests/fixtures/rustdemo/src/main.rs

@@ -0,0 +1,5 @@
+use rustdemo::add;
+
+fn main() {
+    println!("{}", add(2, 3));
+}

tests/fixtures/rustdemo/src/util.rs

@@ -0,0 +1,3 @@
+pub fn helper() -> String {
+    "ok".to_string()
+}