pi-synthetic: v0.16.0

Minor Changes

• 62e6902: Use event-driven Synthetic quota updates without polling.

  Quota data is now extracted from the x-synthetic-quotas response header on Synthetic provider responses and stored centrally. Usage status and quota warnings read the latest quota snapshot through short-lived callbacks from fresh Pi lifecycle contexts, avoiding stale ExtensionContext crashes after reloads or session switches.

• 1176b1d: Avoid stale contexts in status update.

  Use events to retrieve quotas from the shared store.