feat(plan): per-cell record cap (3) + additive overrides

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/routes/admin/plan.ts

@@ -328,18 +328,6 @@ export default async function planRoutes(app: FastifyInstance) {
       );
       if ("error" in result) return error(reply, result.error, result.status);
 
-      // If the create replaced an existing active override, log the soft-delete first.
-      if (result.replacedData) {
-        await logAudit({
-          request,
-          authData: request.authData,
-          action: "delete",
-          entityType: "work_plan_override",
-          entityId: (result.replacedData as any).id,
-          oldValues: result.replacedData as Record<string, unknown>,
-          description: result.replacedDescription,
-        });
-      }
       await logAudit({
         request,
         authData: request.authData,