feat: add experimental test commands xtest1 and xtest2

📋 Change summary:
• Added two new experimental test command files
• xtest1.md - Enhanced testing command implementation
• xtest2.md - Additional testing command variant
• Total: 1,796 lines of new command functionality

These experimental commands extend the testing capabilities
available in the claude-dev-toolkit experimental command set.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: PaulDuvall