gt costs record now auto-detects the current tmux session when running inside tmux, so the Stop hook no longer requires --session flag or GT_SESSION env var. Detection order: 1. --session flag 2. GT_SESSION env var 3. GT_RIG/GT_ROLE derivation 4. Current tmux session (new) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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