fix: correct buyKrk call sites for new opts param, add eslint-disable for polling loop

- no-dilution.spec.ts: pass undefined for opts, screenshotPrefix as 4th arg
- swap.ts: add eslint-disable-next-line for eth_getFilterLogs polling delay

scripts/harb-evaluator/helpers/swap.ts

@@ -154,6 +154,7 @@ export async function buyKrk(page: Page, ethAmount: string, opts?: BuyKrkOptions
         console.log(`[swap] Transfer event received (${logs.length} log(s))`);
         break;
       }
+      // eslint-disable-next-line no-restricted-syntax -- Polling with timeout: eth_getFilterLogs is HTTP-only polling (not push). See AGENTS.md #Engineering Principles.
       await new Promise(r => setTimeout(r, 200));
     }
     // Clean up filter