Enhance test_simple_pattern.wfl with comprehensive pattern matching verification

- Add positive test case for ''hello world'' matching ''hello'' pattern
- Add negative test case for ''goodbye world'' not matching
- Add exact match test for ''hello'' string
- Include clear pass/fail assertions with ✓/✗ indicators
- All tests pass successfully and provide proper validation

Co-authored-by: logbie <logbie@users.noreply.github.com>

Author: claude[bot]

test_simple_pattern.wfl

@@ -3,4 +3,30 @@ create pattern test_pattern:
     "hello"
 end pattern
 
-display "Pattern created successfully"
+display "Pattern created successfully"
+
+// Test positive case - should match
+store test_text1 as "hello world"
+check if test_text1 matches test_pattern:
+    display "✓ PASS: 'hello world' correctly matched the pattern"
+otherwise:
+    display "✗ FAIL: 'hello world' should have matched the pattern"
+end check
+
+// Test negative case - should not match
+store test_text2 as "goodbye world"
+check if test_text2 matches test_pattern:
+    display "✗ FAIL: 'goodbye world' should not have matched the pattern"
+otherwise:
+    display "✓ PASS: 'goodbye world' correctly did not match the pattern"
+end check
+
+// Test exact match
+store test_text3 as "hello"
+check if test_text3 matches test_pattern:
+    display "✓ PASS: Exact match 'hello' worked correctly"
+otherwise:
+    display "✗ FAIL: Exact match 'hello' should have worked"
+end check
+
+display "Pattern matching tests completed!"