feat: add GDPR-compliant engineering practices skill documentation

[mikaelkrief]

Pull Request Checklist

• I have read and followed the CONTRIBUTING.md guidelines.
• I have read and followed the Guidance for submissions involving paid services.
• My contribution adds a new instruction, prompt, agent, skill, or workflow file in the correct directory.
• The file follows the required naming convention.
• The content is clearly structured and follows the example format.
• I have tested my instructions, prompt, agent, skill, or workflow with GitHub Copilot.
• I have run npm start and verified that README.md is up to date.
• I am targeting the staged branch for this pull request.

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Description

Add the GDPR compliant skill

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Type of Contribution

• New instruction file.
• New prompt file.
• New agent file.
• New plugin.
• New skill file.
• New agentic workflow.
• Update to existing instruction, prompt, agent, plugin, skill, or workflow.
• Other (please specify):

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By submitting this pull request, I confirm that my contribution abides by the Code of Conduct and will be licensed under the MIT License.

[Copilot]

Pull request overview

Adds a new Agent Skill documenting GDPR-compliant engineering practices, intended to guide privacy-aware design and implementation decisions across APIs, data models, logging, retention, and incident response.

Changes:

• Added a new skill at skills/gdpr-compliant/SKILL.md containing a comprehensive GDPR engineering checklist and guidance.
• Added the skill entry to the skills index table in docs/README.skills.md.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
skills/gdpr-compliant/SKILL.md	Introduces the new “gdpr-compliant” skill content and frontmatter metadata.
docs/README.skills.md	Adds the new skill to the repository’s skills catalog table.

[github-actions]

🔍 Skill Validator Results

2 resource(s) checked | ✅ All checks passed

Full output

Found 1 skill(s)
[gdpr-compliant] 📊 gdpr-compliant: 2,725 BPE tokens [chars/4: 2,968] (standard ~), 23 sections, 0 code blocks
[gdpr-compliant]    ⚠  Skill is 2,725 BPE tokens (chars/4 estimate: 2,968) — approaching "comprehensive" range where gains diminish.
[gdpr-compliant]    ⚠  No code blocks — agents perform better with concrete snippets and commands.
[gdpr-compliant]    ⚠  No numbered workflow steps — agents follow sequenced procedures more reliably.
�[32m✅ All checks passed (1 skill(s))�[0m