relay: get rid of the message queue, because js is single-threaded.

helpers.ts

@@ -1,37 +1,5 @@
 import { verifiedSymbol, type Event, type Nostr, VerifiedEvent } from './core.ts'
 
-export async function yieldThread() {
-  return new Promise<void>((resolve, reject) => {
-    try {
-      // Check if MessageChannel is available
-      if (typeof MessageChannel !== 'undefined') {
-        const ch = new MessageChannel()
-        const handler = () => {
-          // @ts-ignore (typescript thinks this property should be called `removeListener`, but in fact it's `removeEventListener`)
-          ch.port1.removeEventListener('message', handler)
-          resolve()
-        }
-        // @ts-ignore (typescript thinks this property should be called `addListener`, but in fact it's `addEventListener`)
-        ch.port1.addEventListener('message', handler)
-        ch.port2.postMessage(0)
-        ch.port1.start()
-      } else {
-        if (typeof setImmediate !== 'undefined') {
-          setImmediate(resolve)
-        } else if (typeof setTimeout !== 'undefined') {
-          setTimeout(resolve, 0)
-        } else {
-          // Last resort - resolve immediately
-          resolve()
-        }
-      }
-    } catch (e) {
-      console.error('during yield: ', e)
-      reject(e)
-    }
-  })
-}
-
 export const alwaysTrue: Nostr['verifyEvent'] = (t: Event): t is VerifiedEvent => {
   t[verifiedSymbol] = true
   return true