Frigade checklist — org-switch completion sandbox

Some checklist steps complete at the org level (group.property(...)) and some at the user level (user.eventCount(...)). Frigade stores completion as a monotonic per-user latch, so org-level completions leak across orgs. The fix: on every org switch we reconcile— reset the flow, recompute user-level steps from the user's events, and re-drive the org-level steps the new org satisfies. Complete the org steps in Acme Inc, switch to Globex (brand-new workspace): org steps clear, but user-level steps carry over.