Stream my worker events

A server-sent-events stream (text/event-stream) that signals when the authenticated worker’s /me context changes. It only ever emits the servicing-me-changed event with an empty payload — /me stays the single source of the data — heartbeats every 25 seconds, closes itself after 15 minutes so credentials are re-presented, and returns 429 beyond four open streams per worker. The example shows one decoded stream event.