debug.md was calling `config-get tdd_mode` (top-level key) while every other consumer (execute-phase, verify-phase, audit-fix) uses `config-get workflow.tdd_mode`. This caused /gsd-debug to silently ignore the tdd_mode setting even when explicitly set in config.json. Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>