Refactor Examples to use assert_eq

This commit updates all example files to use `assert_eq!` for verifying
output, replacing the previous `Output:` comments. This change makes the
examples more robust and self-testing.

The benchmark results in some examples have also been slightly adjusted,
reflecting minor performance variations after the refactoring.

Additionally, a runtime panic handling mechanism has been introduced in
the VM for function calls, which improves error reporting for unexpected
panics.

examples/tco_test.myc

@@ -1,11 +1,10 @@
-;; Benchmark: 1.5ms
-;; Benchmark-Repeat: 3
-;; Output: "done"
+;; Benchmark: 1.8ms
+;; Benchmark-Repeat: 3
 (do
   (def count_down (fn [n]
     (if (< n 1)
         "done"
         (count_down (- n 1)))))
 
-  (count_down 10000)
+  (assert-eq "done" (count_down 10000))
 )