Documents the Rails console procedure to toggle
captain_contact_memory_extraction_enabled and
captain_contact_memory_recall_enabled on Account#custom_attributes,
including rollout phasing (extraction-first, then recall), rollback,
bulk enablement, and post-activation verification queries.
The UI toggles in Captain Settings are deferred: the existing
FeatureToggle component is coupled to the captain_features hash and
cannot be reused for custom_attributes-backed flags without a new
component and a new account-update store action. Scope and
implementation notes for that follow-up are included at the end of the
document.
Task 5.4 of Captain Semantic Memory epic (Phase 5).
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