Counter each changing origin in a resident BG gather

Hold both physical groups until all required matching responses allow the original movement. Share normal packet denials across gather and ordinary moves, then resume one original movement suffix.

game/karama-context.ts

@@ -194,6 +194,9 @@ const cancellationSources = {
           ...(response.automaticAdvisorFlip.producer === 'spiritualArrival'
             ? { spiritual:g.pendingSpiritualAdvisor?.source??null } : {}),
           group: g.players.find(p => p.id === response.owner)?.advisors?.[response.location ?? ''] ?? null }
+      : response.advisorGatherMatchingSource
+      ? {matching:response.advisorGatherMatchingSource,
+          pending:g.pendingAdvisorGatherMatching?.receipts[g.pendingAdvisorGatherMatching.index]??null}
       : response.advisorTransportMatchingSource
       ? {matching:response.advisorTransportMatchingSource,pending:g.pendingAdvisorTransportMatching?.receipt??null}
       : response.advisorAmbassadorMatchingSource