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/closure_cracking.myc

@@ -1,4 +1,3 @@
-;; Benchmark: 56ns
-;; Benchmark-Repeat: 36321
-;; Output: 5
-(((fn [x] (fn [] x)) 5))
+;; Benchmark: 110ns
+;; Benchmark-Repeat: 18341
+(assert-eq 5 (((fn [x] (fn [] x)) 5)))