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/tak.myc

@@ -1,17 +1,16 @@
-;; Takeuchi Function Benchmark
-;; heavily recursive, benefits significantly from specialization of integer arithmetic
-;; and direct function calls (skipping dynamic dispatch).
-;; Output: 5
-
-;; Benchmark: 314.2us
+;; Takeuchi Function Benchmark
+;; heavily recursive, benefits significantly from specialization of integer arithmetic
+;; and direct function calls (skipping dynamic dispatch).
+;; Benchmark: 339.7us
+;; Benchmark-Repeat: 7
 
-
-(do
-  (def tak (fn [x y z]
-    (if (<= x y)
-        z
-        (tak (tak (- x 1) y z)
-             (tak (- y 1) z x)
-             (tak (- z 1) x y)))))
-  
-  (tak 12 8 4)
+(do
+  (def tak (fn [x y z]
+    (if (<= x y)
+        z
+        (tak (tak (- x 1) y z)
+             (tak (- y 1) z x)
+             (tak (- z 1) x y)))))
+
+  (assert-eq 5 (tak 12 8 4))
+)