The ConfigInvalidation.setup() function used a module-level boolean flag to prevent duplicate subscriptions, creating a race condition when called concurrently—multiple calls could pass the check before any set the flag.

Changes:

• Replace initialized boolean with setupPromise: Promise<void> | undefined
• Make setup() async, returning the stored Promise on subsequent calls
• Await ConfigInvalidation.setup() in InstanceBootstrap()

Before:

let initialized = false
export function setup() {
  if (initialized) return
  initialized = true
  Bus.subscribe(Config.Event.Updated, async (event) => { ... })
}

After:

let setupPromise: Promise<void> | undefined
export async function setup() {
  if (setupPromise) return setupPromise
  setupPromise = (async () => {
    Bus.subscribe(Config.Event.Updated, async (event) => { ... })
  })()
  return setupPromise
}

Concurrent calls now await the same initialization Promise, ensuring exactly-once setup.

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