docs: Packagist-grade README (marketing pass)

[karlwaldman]

Packagist shows the README as our storefront. Adds: version/downloads/PHP badges (live now the package exists), sharper hero + 2M+ monthly-requests stat (defensible from production api_requests 30d data), popular-commodities table (doubles as SEO keywords on the Packagist page), and an ecosystem cross-link table (python/node/go/MCP/WordPress).

🤖 Generated with Claude Code

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Reviewing files that changed from the base of the PR and between 5ed6614 and 3b87d83.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/packagist-marketing-readme

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