docs: refresh distribution mesh (Wave 2 SEO sweep)

chore: update companion-surfaces mesh (anaconda, RTD, data.world, DoltHub, MotherDuck)

seo: link PyPI calcfidata package (pip install calcfidata)

seo: link 3 Cloudflare Pages live trackers

seo: link live Datasette SQL endpoint (calcfi-open-data.vercel.app)

seo: extend HF Spaces list to all 10 (batch 2: fx, commodity, gdp, labor, credit)

seo: add Author profiles block (ORCID, Academia.edu, GitLab, CodePen, HF)

seo: link CodePen collection (BawbdB) alongside per-pen URLs

seo: add 6 CodePen calculator demos to Visualizations section

seo: add Visualizations section + permanent DOIs + mirror surfaces

Add OSF DOI 10.17605/OSF.IO/PUMKT

Add Kaggle DOI 10.34740/kaggle/dsv/16356447

Add Figshare DOI 10.6084/m9.figshare.32332290 to README + STATUS

Add HF dataset-card YAML frontmatter (license, tags, task_categories)

Initial: 34 daily-refreshed financial datasets, CC BY 4.0