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/object_records.myc

@@ -1,11 +1,10 @@
-;; Benchmark: 1.2us
-;; Benchmark-Repeat: 1731
-;; Output: [150 130 "Insufficient funds" 130]
+;; Benchmark: 1.3us
+;; Benchmark-Repeat: 1528
 
 ; ---------------------------------------------------------
 ; Object-Oriented Records Example
 ; ---------------------------------------------------------
-; This showcase treats a record as an object by storing 
+; This showcase treats a record as an object by storing
 ; closures that capture private state.
 
 (do
@@ -14,15 +13,15 @@
     (do
       ; 'balance' is a captured parameter, acting as private state
       (def balance initial-balance)
-      
+
       {
         ; Method: Get current balance
         :balance (fn [] balance)
-        
+
         ; Method: Deposit money
-        :deposit (fn [amount] 
+        :deposit (fn [amount]
           (assign balance (+ balance amount)))
-        
+
         ; Method: Withdraw money with validation
         :withdraw (fn [amount]
           (if (>= balance amount)
@@ -34,21 +33,20 @@
   ; 1. Create an instance
   (def my-acc (make-account 100))
 
-  ; 2. Call 'deposit' method
-  ; Note the double parens: (.deposit my-acc) gets the function, then we call it
-  ; balance is now 150
-  (def b1 ((.deposit my-acc) 50)) 
+  ; 2. deposit 50 -> balance is now 150
+  (def b1 ((.deposit my-acc) 50))
 
-  ; 3. Call 'withdraw' method
-  ; balance is now 130
-  (def b2 ((.withdraw my-acc) 20)) 
+  ; 3. withdraw 20 -> balance is now 130
+  (def b2 ((.withdraw my-acc) 20))
 
-  ; 4. Call 'withdraw' with invalid amount
+  ; 4. withdraw 1000 -> insufficient funds
   (def error-msg ((.withdraw my-acc) 1000))
 
-  ; 5. Call 'balance' getter
+  ; 5. balance getter
   (def final-balance ((.balance my-acc)))
 
-  ; Return summary of operations
-  [b1 b2 error-msg final-balance]
+  (assert-eq 150 b1)
+  (assert-eq 130 b2)
+  (assert-eq "Insufficient funds" error-msg)
+  (assert-eq 130 final-balance)
 )