init mutation-testing skill

[bohendo]

Adds a mutation-testing plugin providing campaign configuration guidance for mewt and muton. The skill walks through a 5-phase workflow:

1. initializing config
2. scoping targets
3. estimating and optimizing campaign duration
4. validating the test command and timeout
5. running a final pre-flight checklist

Backed by a detailed optimization reference covering per-target test commands, high/medium-severity-only runs, and two-phase campaigns for integration-heavy test suites.

[claude]

Claude Code Review

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[bohendo]

@claude review once

[dguido]

Automated Review — PR #140

Conflicts

None — branch is up to date with main.

Review Findings

All checks pass. No issues found.

• Frontmatter: Valid YAML with name (kebab-case, 16 chars) and description (third-person, includes trigger words: mewt, muton, mutation testing)
• Required sections: "When to Use" and "When NOT to Use" both present in SKILL.md
• Referenced files: workflows/configuration.md and references/optimization-strategies.md both exist, no chained references
• Hardcoded paths: None found
• Progressive disclosure: SKILL.md is 77 lines, details split into workflows/ and references/
• plugin.json ↔ marketplace.json: Versions match (1.0.0), descriptions match
• CODEOWNERS: /plugins/mutation-testing/ @bohendo @dguido — alphabetically correct
• README.md: Listed in Verification section — appropriate category
• Codex symlink: .codex/skills/mutation-testing → ../../plugins/mutation-testing/skills/mutation-testing — correct
• Content quality: Good behavioral guidance with concrete examples, trade-off explanations, and decision trees. Not a reference dump.

Validation

$ python3 .github/scripts/validate_codex_skills.py
Validated 62 plugin skills against 63 Codex entries successfully.

$ python3 .github/scripts/validate_plugin_metadata.py
All plugin metadata is in sync

$ grep hardcoded paths → None found

Changes Made

None — no issues to fix.

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🤖 Reviewed by Claude Code