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DRY pass follow-up (note #1026). All 13 admin-store actions repeated the same lastError-capture/rethrow wrapper; the 6 Tier-A maintenance actions additionally repeated the dry_run POST shape. - _guard(fn): one copy of the lastError=null / try / catch(set lastError; rethrow) wrapper, used by all 13 actions. - _dryRunPost(url, {dryRun, ...extra}): the dry_run POST shape on top of _guard, used by the 6 maintenance actions. reconcile maps sourceId -> source_id. Public exports + every action signature unchanged (object-opts for Tier-A, positional for cascade/bulk/tag ops), so no card/view changes. Behavior identical. Added frontend spec (the admin store had none): _dryRunPost endpoint+body+default, sourceId->source_id mapping, and _guard capturing lastError + clearing on success. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>