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StepRegistry.add read existing = self.data['steps'].get(step_id, {}) then called
existing.get('installed_at', ...). A corrupted-but-parseable registry holding a
non-dict entry (e.g. {'steps': {'foo': 'corrupted'}}) — which _load() accepts,
since it validates only the top-level dict and that 'steps' is a dict — made
add() raise AttributeError. WorkflowRegistry.add was hardened for exactly this
(#3419); mirror its isinstance guard so a non-dict existing entry is treated as
absent.
Test copies the WorkflowRegistry sibling test for StepRegistry (fails before:
AttributeError on existing.get()).
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>