- Scratch agent uses fixed folder `_ping-test` so it can never collide
with a real agent on re-runs
- Added --folder flag to init-cli-agent.ts and cli-agent step wrapper
- Delete always targets `_ping-test` exactly — no re-derivation needed
- Removed normalizeName coupling and FOLDER status field (no longer needed)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>