Add manual outreach funnel clearing

docs/data-flow.md

@@ -46,6 +46,8 @@ An account is eligible for new outreach only when its runtime is running, both i
 
 Matrix cooldowns retain the operation that triggered them. A room-creation or invitation limit pauses new outreach but does not suppress replies in existing rooms; a limit returned while sending into an existing room pauses those sends as well.
 
+The operator can manually clear the unsent funnel from the authenticated dashboard. The repository atomically moves discovered, screening, ready, and retryable candidates to a terminal rejection with the reason `Cleared manually by operator`, releases their leases, and retains the audit rows so those candidates are not rediscovered. A `sending` lease is never changed because its remote Matrix outcome may already be in flight. Clearing does not change bot mode; running discovery may refill the funnel immediately.
+
 Screening, retry promotion, dispatch, and the operator's active-queue view are ordered by the Reddit post creation time, newest first; source priority is only a tie-breaker. The dispatch worker leases the newest ready candidate for an account, materializes the processed post in that account's repository, applies the account rate limiter, checks dry-run, and atomically claims the recipient globally. `ChatService.startConversationDetailed()` returns one of:
 
 - `sent`: persist the message and outcome metadata, commit recipient history, update activity, and mark the candidate sent;