Added vcpkg skill

[AugP]

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, workflow, or canvas extension 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, workflow, or canvas extension with GitHub Copilot.
• I have run npm start and verified that README.md is up to date.
• I am targeting the main branch for this pull request.

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Description

Added a skill to enhance Copilot's support for the vcpkg package manager. Skill was already demoed for the Pure Virtual C++ 2026 conference using Copilot CLI. Now I hope to share it with the community.

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Type of Contribution

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

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Additional Notes

About me: I am the product manager for vcpkg.

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]

🔒 PR Risk Scan Results

Scanned 5 changed file(s).

Severity	Count
🔴 High	0
🟠 Medium	1
ℹ️ Info	0

Severity	Rule	File	Line	Match
🟠	package-exec-command	docs/README.skills.md	31	| [acreadiness-assess](../skills/acreadiness-assess/SKILL.md)<br />`gh skills install github/awesome-copilot acreadiness-assess` | Run the AgentRC readiness assessment on the curre

This is an automated soft-gate report. Findings indicate review targets and do not block merge by themselves.

[github-actions]

🔍 Vally Lint Results

✅ All checks passed

Scope	Checked
Skills	1
Agents	0
Total	1

Severity	Count
❌ Errors	0
⚠️ Warnings	0
ℹ️ Advisories	0

Summary

Level	Finding
ℹ️	npm warn EBADENGINE Unsupported engine {
ℹ️	npm warn EBADENGINE package: 'commander@15.0.0',
ℹ️	npm warn EBADENGINE required: { node: '>=22.12.0' },
ℹ️	npm warn EBADENGINE current: { node: 'v20.20.2', npm: '10.8.2' }
ℹ️	npm warn EBADENGINE }
ℹ️	npm warn deprecated prebuild-install@7.1.3: No longer maintained. Please contact the author of the relevant native addon; alternatives are available.
ℹ️	✅ vcpkg (2/2 checks passed)
ℹ️	✓ [spec-compliance] All 1 skill(s) are spec-compliant.
ℹ️	✓ spec-compliance: All spec checks passed.
ℹ️	✓ [valid-refs] All file references across 1 skill(s) are valid.

Full linter output

### Linting skills/vcpkg
npm warn EBADENGINE Unsupported engine {
npm warn EBADENGINE   package: 'commander@15.0.0',
npm warn EBADENGINE   required: { node: '>=22.12.0' },
npm warn EBADENGINE   current: { node: 'v20.20.2', npm: '10.8.2' }
npm warn EBADENGINE }
npm warn deprecated prebuild-install@7.1.3: No longer maintained. Please contact the author of the relevant native addon; alternatives are available.
✅ vcpkg (2/2 checks passed)
    ✓ [spec-compliance] All 1 skill(s) are spec-compliant.
        ✓ spec-compliance: All spec checks passed.
    ✓ [valid-refs] All file references across 1 skill(s) are valid.
        ✓ valid-refs: All file references resolve to existing files within the skill directory.

1 skill(s) linted, 1 passed

[Copilot]

Pull request overview

Adds a vcpkg skill covering dependency management, versioning, integration, and cross-platform builds.

Changes:

• Adds core vcpkg guidance.
• Adds registries, CI/CD, and troubleshooting references.
• Adds the skill to the generated documentation index.

Show a summary per file

File	Description
skills/vcpkg/SKILL.md	Defines the core skill guidance.
skills/vcpkg/references/ci.md	Documents CI/CD and caching.
skills/vcpkg/references/registries.md	Covers registries and overlays.
skills/vcpkg/references/troubleshooting.md	Covers diagnostics and maintenance.
docs/README.skills.md	Indexes the new skill.

Review details

• Files reviewed: 5/5 changed files
• Comments generated: 23
• Review effort level: Medium

[AugP]

Will make a few changes and re-open when done.

[Copilot]

Review details

• Files reviewed: 5/5 changed files
• Comments generated: 10
• Review effort level: Medium

[Copilot]

Review details

• Files reviewed: 5/5 changed files
• Comments generated: 5
• Review effort level: Medium

[AugP]

Made a bunch of fixes, opened PR again.

[Copilot]

Review details

• Files reviewed: 5/5 changed files
• Comments generated: 1
• Review effort level: Medium

[Copilot]

Review details

• Files reviewed: 5/5 changed files
• Comments generated: 5
• Review effort level: Medium

[Copilot]

Review details

• Files reviewed: 5/5 changed files
• Comments generated: 4
• Review effort level: Medium

[Copilot]

Review details

• Files reviewed: 5/5 changed files
• Comments generated: 4
• Review effort level: Medium

[AugP]

@aaronpowell this is ready for human review.