docs: Update CLAUDE.md with streamlined developer guidance
- Reduced from 1116 to 526 lines (53% reduction) - Focused on architecture and testing requirements - Removed redundant user-facing documentation - Added critical development notes and workflows 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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