Description

SSE event streams in server.ts and routes/global.ts leak memory when clients disconnect. The stream.writeSSE() calls are fire-and-forget, so write failures to dead connections go undetected. Bus listeners and heartbeat intervals keep accumulating across reconnects.

In long-running sessions with many reconnects, this causes steady memory growth (~15+ MB observed) from orphaned listeners and intervals that are never cleaned up.

Steps to reproduce

1. Start the OpenCode server (bun dev serve)
2. Open multiple SSE connections (e.g. via browser tabs or curl)
3. Close the connections abruptly (kill the client without a clean close)
4. Repeat steps 2-3 many times
5. Observe that Bus subscription counts grow and memory usage increases steadily

OpenCode version

Latest dev branch

Operating System

macOS (reproduced), likely affects all platforms