Add generated status visual

[ioana (ioanahayman)]

Summary

Adds a generated SVG status panel to the top of the repository README so reviewers can see the current Runneth primitive status before reading the raw feed.

The panel is generated from the committed status.json and shows active guidance across the supported primitives, the feed update time, and the active notice summaries. It gives the repo a lightweight status-page view while keeping status.json as the source of truth Agent Builder reads.

What Changed

• Adds status.svg, rendered from the current committed feed and embedded at the top of README.md.
• Adds render-status-card.mjs, a dependency-free renderer that validates the basic feed shape and regenerates the SVG from status.json.
• Adds a GitHub Actions validation check that formats status.json, regenerates the SVG, and fails if the committed visual is out of date.
• Updates the README editing instructions so feed changes stay reviewable through GitHub commits and PRs.

Validation

• node --check render-status-card.mjs
• python3 -m json.tool status.json > /tmp/runneth-status.json
• node render-status-card.mjs && git diff --check
• node render-status-card.mjs && git diff --exit-code -- status.svg