v4.2.1

Isaac Automator v4.2.1

Maintenance release: relocates the AI operator-agent docs into an ai/ subdirectory to keep the repo root tidy.

Changed

• Moved automator.agent.md and skills/ under ai/ (now ai/automator.agent.md and ai/skills/).
• Updated the links in AGENTS.md, CLAUDE.md, and the README to point at the new locations.

AGENTS.md and CLAUDE.md remain at the repo root (where agent tools discover them). No functional/CLI changes.