Run local usage services in a supervised backend process (#40792)

* Move local usage services into a supervised backend process

* Own usage recovery and worker retirement lifetimes

* Preserve answered usage data during background refresh

* Run independent usage scans concurrently in the backend

* Limit backend startup paths to the delegated usage service

* Show usage failures through backend recovery

* Include usage failure strings in the English catalog

* Keep usage update details beside refresh failures

* Resolve usage freshness failure from the final producer snapshot

* Retain the forced refresh completion requirement

* Keep managed backend failures out of application crash reports

* Preserve usage recovery boundaries across backend reconnects

* Match the backend RPC cancellation signal in the usage seam proof

* Avoid serializing backend requests before port delivery

* Keep receiving request validation in the boundary schemas

* test: align usage transport coverage with renderer project

* fix: preserve unknown usage state and renderer retirement

* fix(usage): revalidate tracking before scan admission

* fix(usage): retry failed backend startup on demand

* test(usage): isolate stale backend ownership checks

src/preload/api/codex-usage-bridge.ts

@@ -1,8 +1,8 @@
-import { ipcRenderer } from 'electron'
+import { backendUsageTransport } from '../backend-port-client'
 import { createUsageProviderApi } from '../usage-provider-api'
 import type { PreloadApi } from '../api-types'
 
 export const codexUsageApi = createUsageProviderApi(
-  ipcRenderer,
+  backendUsageTransport,
   'codexUsage'
 ) satisfies PreloadApi['codexUsage']