fix: clarify shared skills and path drift

[nyldn]

Summary

• classify skill names shared across tool-specific roots as informational
• keep invalid skill frontmatter as a warning
• replace destructive PATH cleanup advice with safe preferred-executable guidance
• release as 0.1.2

Verification

• 36 tests, 137 assertions, 0 failures
• Ruby and shell syntax checks pass
• deterministic release archive SHA-256: 757922c4e02adf606ec621cb60c7767ee58a227cb5d46664f62eff22e75e480e
• install/uninstall round trip passes
• Gitleaks history scan passes

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 5255d9de-cd3b-4082-9e50-3c29cc2b242c

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