Add comprehensive test coverage for the workflow.use_worktrees config toggle:
- config-get returns false after setting to false (roundtrip verification)
- config-get errors with "Key not found" when not set (validates workflow
fallback behavior where `|| echo "true"` provides the default)
- config-get returns true after setting to true
- Toggle back and forth works correctly
- Structural tests verify USE_WORKTREES is wired into quick.md,
diagnose-issues.md, execute-plan.md, planning-config.md, and config.cjs
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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