CommandPolicy.ensureRollback rejects every rollback command unless providerRollbackReturnsSnapshot accompanies the rollback capabilities, so checkpoint reverts on Pi threads failed with 'rollback must return a providerInstanceId thread snapshot'. rollbackThread already returns the updated provider thread; declare it. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Wout Stiens committed on 9/1/2026, 5:42:52 AMparent855b00f
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