This folder is used for experimentation and temporary work.

• Never committed to git — automatically ignored
• Never auto-purged — user decides when to clean up
• Analyze mode: read-write — experiment freely here
• Design mode: read-only — no experiments in design mode
• Create mode: read-write — can experiment if needed

• tests/ — tester subagent writes hypothesis validation tests here
• drafts/ — drafter subagent writes content sections here

To clean up playground files:

rm -rf .playground/*

Or keep them for reference — they do no harm.