tmux has-session -t does prefix matching by default, so "gt-deacon-boot"
would match when checking for "gt-deacon". This caused gt start to think
the Deacon was running when only a stale gt-deacon-boot session existed.
Using "=" prefix forces exact matching in tmux.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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