Add CLAUDE.md to reference AGENTS.md

Author: TerryHowe

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+See AGENTS.md for comprehensive project documentation including:
+- Project overview and code structure
+- Build, test, and development setup commands
+- Code style conventions (PEP8, 120 char lines)
+- Module patterns and security considerations
+- Testing guidelines and CI/CD workflow
+
+## Quick Reference
+
+```bash
+# Run all tests
+tox
+
+# Lint only
+tox -e pep8
+
+# Functional tests (requires Vault)
+tox -e py39
+
+# Development install
+./link.sh
+```