Add EU SPARQL search skill to regulatory-legal plugin

[dobry21]

Summary

• Adds a new eu-sparql-search skill to the regulatory-legal plugin for querying EU legislation and CJEU case law via the Publications Office SPARQL endpoint (Cellar / EUR-Lex CDM ontology)
• Includes references/resource-types.md with the full list of EU document type URIs
• Updates regulatory-legal/README.md and root README.md command reference tables
• Bumps regulatory-legal plugin version 1.0.2 → 1.1.0 (minor bump for new skill, per CONTRIBUTING.md)

What the skill does

Enables Claude to search EU legislation and CJEU case law without leaving the conversation:

• Search by document type (REG, DIR, DEC, JUDG, …), CELEX number, date range, EuroVoc subject, or in-force status
• Retrieve downloadable file URLs for any language (ISO 639-3: POL, ENG, DEU, …) and format (pdfa2a, fmx4, xhtml)
• Execute SPARQL queries against https://publications.europa.eu/webapi/rdf/sparql via bash_tool + Python/urllib (bypasses web_fetch restrictions that block Cellar URLs)
• Fetch full document text via curl once item URLs are retrieved
• Always provides verifiable EUR-Lex + Cellar citation links
  The skill is entirely self-contained — all query patterns, language codes, format rules, and citation requirements are baked into SKILL.md. It does not depend on CLAUDE.md guardrails to produce correct output.

Files changed

regulatory-legal/skills/eu-sparql-search/SKILL.md (new)
regulatory-legal/skills/eu-sparql-search/references/resource-types.md (new)
regulatory-legal/.claude-plugin/plugin.json (1.0.2 → 1.1.0)
regulatory-legal/README.md (skill table entry)
README.md (command reference entry)

Test plan

• /regulatory-legal:eu-sparql-search 32016R0679 — returns GDPR metadata with EUR-Lex link
• Date range query — returns filtered results with LIMIT and ORDER BY DESC
• CJEU case law query (JUDG type) — uses correct resource-type URI
• Citation output includes both EUR-Lex canonical URL and Cellar item URL

[github-actions]

Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

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I have read the CLA Document and I hereby sign the CLA

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1 out of 2 committers have signed the CLA.
✅ dobry21
❌ @claude
_{You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.}

[dobry21]

I have read the CLA Document and I hereby sign the CLA