Add github-release skill and references

[amorguettinogueira]

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

Introduce a new github-release skill: adds skills/github-release/SKILL.md with a 9-step GitHub release workflow (gh/git-based, SemVer, Keep a Changelog guidance). Also adds reference heuristics for commit classification and SemVer decision rules, and updates docs/README.skills.md to list the new 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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Additional Notes

N/A

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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.

[github-actions]

🔍 Skill Validator Results

⚠️ Warnings or advisories found

Scope	Checked
Skills	1
Agents	1
Total	2
Severity	Count
---	---:
❌ Errors	0
⚠️ Warnings	1
ℹ️ Advisories	0

Summary

Level	Finding
ℹ️	Found 1 skill(s)
ℹ️	[github-release] 📊 github-release: 3,640 BPE tokens [chars/4: 3,577] (standard ~), 43 sections, 19 code blocks
ℹ️	[github-release] ⚠ Skill is 3,640 BPE tokens (chars/4 estimate: 3,577) — approaching "comprehensive" range where gains diminish.
ℹ️	✅ All checks passed (1 skill(s))

Full validator output

```text Found 1 skill(s) [github-release] 📊 github-release: 3,640 BPE tokens [chars/4: 3,577] (standard ~), 43 sections, 19 code blocks [github-release] ⚠ Skill is 3,640 BPE tokens (chars/4 estimate: 3,577) — approaching "comprehensive" range where gains diminish. ✅ All checks passed (1 skill(s)) ```