Cleanup
Removes all language that implied Purple Loop was AI-built.
- Deleted AGENT_PLAYBOOK.md (AI build agent playbook)
- Deleted AGENTS.md (AI ponytail ruleset)
- Scrubbed Hermes dispatch commands from STARTUP.md
- Removed ponytail/AGENTS.md references from CONTRIBUTING.md
- Cleaned DESIGN.md header, PITFALLS.md, PROGRESS.md, dashboard.html
The repo no longer references any AI build tooling anywhere.
Full Changelog: v1.4.1...v1.4.2