_try_dispatch guarded only 'if not integration_key', then called
get_integration(integration_key). A non-string integration (a list/dict, or an
expression like integration: "{{ steps.pick.output.agents }}" that resolves to a
list) reached the registry dict lookup and raised 'TypeError: unhashable type:
list', aborting the entire workflow run. Widen the guard to also require a str,
so a non-string integration is treated as not-dispatchable and execute() falls
through to its existing FAILED StepResult (unconfigured integration=None still
returns None as before). Applied to both command and prompt steps.
Tests: a list integration now yields a FAILED result (fail before: TypeError).
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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