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/hof.myc

@@ -1,10 +1,9 @@
 ;; Higher-Order Function Example
-;; Benchmark: 56ns
-;; Benchmark-Repeat: 36342
-;; Output: 25
+;; Benchmark: 112ns
+;; Benchmark-Repeat: 17678
 (do
   (def apply (fn [f x] (f x)))
   (def square (fn [x] (* x x)))
 
-  (apply square 5)
+  (assert-eq 25 (apply square 5))
 )