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/macro_issue.myc

@@ -1,7 +1,6 @@
-;; Benchmark: 55ns
-;; Benchmark-Repeat: 35990
-;; Output: 42
+;; Benchmark: 107ns
+;; Benchmark-Repeat: 18414
 (do
   (macro t [x] `(fn [~x] ~x))
   (def id (t a))
-  (id 42))
+  (assert-eq 42 (id 42)))