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The StaleWorker sends DMs from 'system' to all channel members when workflow messages are stuck in 'proposed' state. These DMs were triggering reactive agent runs, which couldn't action the stale messages, burning daily budget on wasted K8s Jobs. Now: reactor silently ignores all messages from 'system' sender. System notifications are for human review, not agent action. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>