Complete Phase 5: End-to-end control flow & exception testing - Full pipeline verified

Co-authored-by: moe-charm <217100418+moe-charm@users.noreply.github.com>

simple_loop_test.nyash

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+local i
+i = 0
+loop(i < 3) {
+    print(i)
+    i = i + 1
+}

simple_loop_test2.nyash

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+loop(true) {
+    print("Loop iteration")
+}

simple_loop_test3.nyash

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+loop(false) {
+    print("This should not execute")
+}
+print("Loop completed")

simple_test.nyash

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+print("Simple test")

simple_throw_test.nyash

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+print("Testing throw")
+throw "Simple exception"

simple_try_test.nyash

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+try {
+    print("In try block")
+    throw "Test exception"
+} catch (Exception e) {
+    print("Caught exception")
+}