Contracts

Use contracts when replacing persistence, redaction, approval, or dashboard behavior.

Contract	Role
`FlowStore`	Aggregates run, step, audit, approval, and webhook repositories.
`RunRepository`	Persists and retrieves run state.
`RunNodeRepository`	Persists per-node execution rows (a v1 step is a `legacy.step` node).
`AuditRepository`	Appends audit rows.
`ApprovalRepository`	Stores approval token state.
`ApprovalDecisionRepository`	Supports approve and reject decisions.
`ConditionalRunRepository`	Supports conditional run state transitions.
`PayloadRedactor`	Redacts sensitive payload keys.
`RedactorAwareFlowStore`	Receives execution-scoped redactor instances.
`FlowDashboardReadModel`	Provides dashboard read queries.
`DashboardActionAuthorizer`	Authorizes dashboard actions.

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