fix(watcher): graceful type-flip degradation + regression tests#116
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_apply_raw now catches TypeMismatchError, logs a warning, and falls back to the field's default value (matching Go SDK behavior). Previously a type mismatch from the server would propagate uncaught and crash the background subscribe thread/task. Adds regression tests for both sync (WatchedField, ConfigWatcher) and async (AsyncWatchedField, AsyncConfigWatcher) paths: _load_initial type-flip falls back to default; _update type-flip falls back to default; _process_change type-flip continues the stream. Refs #563 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
floattostring) would propagateTypeMismatchErroruncaught through_apply_raw→_update→_process_change, killing the background subscribe thread/task silently._apply_rawnow catchesTypeMismatchError, logs a warning, and resets to the field's registered default value — matching Go SDK behavior.WatchedField,ConfigWatcher) and async (AsyncWatchedField,AsyncConfigWatcher) paths.Test plan
test_load_initial_type_flip_falls_back_to_default— snapshot with unconvertible value uses default.test_update_type_flip_falls_back_to_default— stream update with unconvertible value uses default.test_type_flip_mid_stream_uses_default_and_continues— bad update resets to default; subsequent valid update still applies.test_watcher.py) and async (test_async_watcher.py) variants.Refs opendecree/decree#563