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/optimizer_purity.myc

@@ -1,7 +1,6 @@
-;; Benchmark: 68ns
-;; Benchmark-Repeat: 36112
-;; Output: 31.41592653589793
+;; Benchmark: 111ns
+;; Benchmark-Repeat: 18959
 (do
   (def area (fn [x] (* PI x)))
-  (area 10)
+  (assert-eq 31.41592653589793 (area 10))
 )