Add v-development skill 🤖🤖🤖

[ulises-jeremias]

Adds a new v-development skill that teaches Copilot how to work with the V language (vlang): toolchain setup, v.mod project layout, build/test/format/vet commands, and idiomatic V including Option/Result error handling, immutability, and no-null rules.

There is currently no V coverage among the 419 skills, and frontier models frequently emit invalid V (Go/Rust idioms translated literally, invented null checks). This skill addresses that gap with stable, checkable toolchain facts grounded in the official V docs.

Validation performed: npm run skill:validate passes (419/419) and npm run build regenerated docs/README.skills.md, both included in this PR. Content was cross-checked against https://docs.vlang.io and the V toolchain; I could not live-test against Copilot itself in this environment, so reviewer testing is welcome.

Disclosure: I maintain V ecosystem projects (RxV, Create Awesome V App) and the Agent Toolkit, whose V practices informed this skill. The skill text itself is original and vendor-neutral.

[github-actions]

🔒 PR Risk Scan Results

Scanned 1 changed file(s).

Severity	Count
🔴 High	0
🟠 Medium	0
ℹ️ Info	0

✅ No matching risk patterns were detected in changed files.

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

[github-actions]

🔴 Contributor Reputation Check: HIGH risk

Check	Risk
Profile	HIGH
Credential audit	NONE

Maintainers: please review this contributor before merging.
See the workflow run for full details.
Automated check powered by AGT.

[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	✅ v-development (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.
ℹ️	✓ valid-refs: All file references resolve to existing files within the skill directory.
ℹ️	1 skill(s) linted, 1 passed

Full linter output

### Linting skills/v-development
✅ v-development (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]

🟡 Changes recommended

The skill contains incorrect v.mod dependency fields and misleading project entry-point guidance.

Get a fresh assessment by requesting another Copilot review.

Pull request overview

Adds V language development guidance covering tooling, project structure, and idiomatic error handling.

Changes:

• Adds the v-development skill.
• Registers it in the generated skills catalog.

File summaries

File	Description
skills/v-development/SKILL.md	Defines V development guidance.
docs/README.skills.md	Adds the skill to the catalog.

Review details

Suppressed comments (1)

skills/v-development/SKILL.md:86

• This repeats the invalid manifest key from the example. Dependencies must be recorded under dependencies, otherwise the skill will direct users to edit a field that V does not consume.

- When adding a dependency, record it in `v.mod` under `deps` and mention the `v install` command.

• Files reviewed: 2/2 changed files
• Comments generated: 3
• Review effort level: Balanced

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