Detects when multiple gt-* tmux sessions share the same pane, which causes messages sent to one session to appear in another. This catches the bug where gt-deacon and gt-mayor shared a pane, causing daemon heartbeats to appear as user input in the Mayor. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>