fix(ralph-loop): abort stale Oracle sessions before ulw verification restart

When Oracle verification fails in ulw-loop mode, the previous Oracle
session was never aborted before restarting. Each retry created a new
descendant session, causing unbounded session accumulation and 500
errors from server overload.

Now abort the old verification session before:
- restarting the loop after failed verification
- re-entering verification phase on subsequent DONE detection

src/hooks/ralph-loop/verification-failure-handler.ts

@@ -68,6 +68,10 @@ export async function handleFailedVerification(
 		return false
 	}
 
+	if (state.verification_session_id) {
+		ctx.client.session.abort({ path: { id: state.verification_session_id } }).catch(() => {})
+	}
+
 	const resumedState = loopState.restartAfterFailedVerification(
 		parentSessionID,
 		messageCountAtStart,