docs: organize stock valuation artifacts and guide

Cai

2026-08-04 da730108a672e1daf25fdcce9fd74887e3fd65c3

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.mbx/provider/
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.mbx/inbox/
.mbx/local/
ai-*/tmp/
tmp/
node_modules/
build/
.pytest_cache/
.mypy_cache/
*.tmp
*.log
__pycache__/
*.py[cod]