Pace engine reads under the proxy's rate limit

The proxy allows 10 requests a second per address and answers the rest
503. Limiting how many reads run at once still sent 40-50 a second, since
each answers in about 100 ms. Reads now share one pace of 8 a second,
actions skip the queue, and a 503 pauses every read for 2 seconds.
Results and Schedule share each schedule's production status, and an
archived schedule is read once until an action.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/main.tsx

@@ -6,6 +6,7 @@ import { MutationCache, QueryClient, QueryClientProvider } from '@tanstack/react
 import { BrowserRouter } from 'react-router-dom'
 import { EngineError } from './api/client'
 import App from './App'
+import { forgetReads } from './express/results'
 import { useLang } from './i18n'
 import './styles/mockup.css'
 import './styles/app.css'
@@ -17,8 +18,12 @@ if (!clerkPubKey) {
 }
 
 const queryClient: QueryClient = new QueryClient({
-  // Any action may have spent workspace credits, so the topbar balance is read again after each one.
-  mutationCache: new MutationCache({ onSettled: () => queryClient.invalidateQueries({ queryKey: ['credits'] }) }),
+  mutationCache: new MutationCache({
+    // Runs before the action's own onSuccess, whose invalidations must not get a remembered read.
+    onSuccess: forgetReads,
+    // Any action may have spent workspace credits, so the topbar balance is read again after each one.
+    onSettled: () => queryClient.invalidateQueries({ queryKey: ['credits'] }),
+  }),
   defaultOptions: {
     // Retrying a 4xx (auth, credits, validation) only repeats the same answer.
     queries: {