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_fp_check_advance_post_shop: in_progress + all steps terminal → awaiting_cert (cert required) or awaiting_ship. Auto-spawns cert + delivery and fires notifications. Idempotent. Does NOT raise — gate failures bubble up via fp.job.step.button_finish (Task 4). _fp_check_advance_after_cert_issue: awaiting_cert → awaiting_ship when every required cert is state=issued. _fp_check_regress_after_cert_void: awaiting_ship → awaiting_cert when a previously-issued cert is voided. Re-notifies QM. hasattr guards on _fp_schedule_cert_activity + _fp_resolve_cert_activities keep this safe during incremental rollout — those land in Task 20. Test scaffolding added covering helper existence + idempotency. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>