feat(docs): add comprehensive documentation structure - Fixes #52
- Add docs/ directory with 17 documentation files
- Architecture: multi-agent-system, data-flow, llm-integration
- API Reference: trading-graph, agents, dataflows
- Guides: adding-new-analyst, adding-llm-provider, adding-data-vendor, configuration
- Testing: README, running-tests, writing-tests
- Development: setup, contributing
- Update PROJECT.md with TESTING STRATEGY requirements
- Add test_documentation_structure.py for validation
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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