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/record_optimizations.myc

@@ -1,12 +1,11 @@
-;; Benchmark: 882.7us
+;; Benchmark: 868.2us
 ;; Benchmark-Repeat: 4
 ;; Tests the effect of record inlining and field lookup optimization
-;; Output: 10000
 (do
   (def config {:start 0 :limit 10000 :step 2})
   (def x (.start config))
 
   (while (< x (.limit config))
          (assign x (+ x (.step config))))
-  x
+  (assert-eq 10000 x)
 )