Watcher tasks get task-scoped IPC dirs (data/ipc/{group}/tasks/{taskId}/),
but the MCP server used HOST_IPC_DIR to write IPC files. Without
EJCLAW_HOST_IPC_DIR, it fell back to the task-scoped path, writing
cancel_task/send_message files to nested dirs the IPC watcher never scans.
This caused 11 zombie watchers stuck in infinite loops — self-cancel
calls silently failed with ~4000 stranded IPC files accumulating.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
5620301024