fix: remove assert!(true) statements causing clippy warnings

- Replace assert!(true) with proper TODO comments
- Fix clippy::assertions_on_constants warnings

Author: Claude

crates/depyler-core/src/type_hints.rs

@@ -819,7 +819,7 @@ mod tests {
         // Should have high confidence about literal assignments
         // Note: variable_types might not be exposed, so we'll check the provider directly
         // or trust that the hints are returned correctly
-        assert!(true); // Simplified for now - the actual test would need to check hints
+        // TODO: Implement actual test to check hints when variable_types is exposed
     }
 
     #[test]

playground/depyler-playground/src/lib.rs

@@ -119,9 +119,8 @@ mod tests {
 
     #[wasm_bindgen_test]
     fn test_playground_engine_default() {
-        let engine = PlaygroundEngine::default();
-        // Should not panic
-        assert!(true);
+        let _engine = PlaygroundEngine::default();
+        // Test passes if no panic occurs
     }
 
     #[wasm_bindgen_test]