docs: publish asset-class data-source references

[stefan-jansen]

Summary

Publish current asset-class source references that distinguish library-supported providers from verified external products.

Milestone

• Split liquid market sources into asset-class references #68 Split liquid market sources into asset-class references
• Add economic and specialized source references #69 Add economic and specialized source references
• Enforce source-reference and provider-mapping contracts #70 Enforce source-reference and provider-mapping contracts

Verification

• uv run python scripts/validate_source_references.py
• uv run ruff check src tests scripts
• uv run ruff format --check src tests scripts
• uv run ty check
• uv run pytest tests -q -ra
• uv run pytest tests -q -ra -W error::ResourceWarning
• uv run mkdocs build --strict
• uv build
• actionlint .github/workflows/*.yml
• pre-commit run --all-files
• Live product-link checks for every changed source-reference page

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