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5401d54eaa
### Changes 🏗️ Fixes **AUTOGPT-SERVER-7JA** (123 events since Jan 27, 2026). #### Problem `StreamHeartbeat` was added to keep SSE connections alive during long-running tool executions (yielded every 15s while waiting). However, the main `stream_chat_completion` handler's `elif` chain didn't have a case for it: ``` StreamTextStart → ✅ handled StreamTextDelta → ✅ handled StreamTextEnd → ✅ handled StreamToolInputStart → ✅ handled StreamToolInputAvailable → ✅ handled StreamToolOutputAvailable → ✅ handled StreamFinish → ✅ handled StreamError → ✅ handled StreamUsage → ✅ handled StreamHeartbeat → ❌ fell through to 'Unknown chunk type' error ``` This meant every heartbeat during tool execution generated a Sentry error instead of keeping the connection alive. #### Fix Add `StreamHeartbeat` to the `elif` chain and yield it through. The route handler already calls `to_sse()` on all yielded chunks, and `StreamHeartbeat.to_sse()` correctly returns `: heartbeat\n\n` (SSE comment format, ignored by clients but keeps proxies/load balancers happy). **1 file changed, 3 insertions.**