## Summary - Add 87+ new tests across 5 test suites covering v0.9.0 gaps: ChoicePickerWidgetTest, SurfaceStateManagerTest, FunctionEvaluatorTest, A2UIExtensionParamsTest, and UiDefinitionExtendedTest - Fix evaluateRegex crash on JS target by widening catch (Exception) to catch (Throwable) so JavaScript SyntaxError from invalid regex patterns is properly caught - Fix illegal comma in Kotlin/Native test name - Update changelog with test coverage details ## Test plan - [x] All new tests pass on JVM - [ ] Verify JS/browser tests pass (previously failing regex_invalidPatternReturnsFalse now fixed) - [ ] Verify Kotlin/Native tests pass (illegal comma in test name fixed) #14