plan(SP21): universal drill-down — 5 phases, ~40 tasks
Phase 1: drill primitives (DrillStackProvider, DrillableCell, PeekModal,
DrillDrawerHeader) + PayerPeekContent + ValidationRulePeekContent +
/api/payers/{id}/summary backend + Dashboard KPI/provider/denial drills.
Phase 2: ProviderDrawer + activity event routing for claim_* events.
Phase 3: ProviderDrawer tabs (Claims/Activity) + remaining event routing.
Phase 4: RemitDrawer + 4 surfaces (Remittances, BatchDiff, Inbox,
Reconciliation navigate).
Phase 5: AckDrawer + 8 final surfaces (Claims, Batches, Acks, Providers,
ActivityLog, BatchDiff, Inbox, Reconciliation).
Each phase = 1 PR, shippable independently with its own smoke slice.
Spec: docs/superpowers/specs/2026-06-21-cyclone-universal-drilldown-design.md
Tyler
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