chore: mark low-only review findings as mergeable

[dyoshikawa-claw]

Summary

• update comment-to-ai workflow review instruction so the overall verdict is mergeable when findings are only low severity or below
• keep medium/high/critical as merge blockers

Validation

• pnpm cicheck passed before PR creation

[github-actions]

PR #1253 Review: Mergeability Verdict

Overall Verdict: ✅ MERGEABLE

Both code and security reviews found only low-severity issues (no medium/high/critical blockers). This PR actually improves security by making medium-severity issues merge blockers.

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Code Review Findings

1. [Low] Behavioral change misclassified as "chore"

   • The PR changes policy (medium severity now blocks), but uses chore: prefix
   • Consider using feat: or refactor: for accurate changelog generation

2. [Low] Phrasing "low severity or lower" is ambiguous

   • Unclear what severity levels exist below "low" (informational? note?)
   • Suggestion: Use "low severity or informational" or just "low severity"

3. [Positive] Improved clarity

   • New wording is more explicit and actionable
   • Parenthetical clarification "(no medium/high/critical blockers)" removes ambiguity

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Security Review Findings

4. [Positive - Security Improvement] Stricter mergeability criteria

   • Old: Medium issues were non-blockers
   • New: Medium issues are blockers (improves security posture)

5. [Medium - Advisory Note] Enforcement is advisory-only

   • AI review verdict doesn't technically block merges
   • Relies on branch protection rules and human reviewers
   • Consider documenting whether this is advisory or required

6. [Positive] Prompt clarity improvement

   • Reduces risk of AI misinterpreting criteria
   • More consistent security assessments

7. [Verified Safe] No script injection concerns

   • Only modifies AI prompt text
   • No shell command interpolations or untrusted input

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Summary

This PR tightens security criteria by elevating medium-severity issues to merge blockers. All findings are low severity or informational. The change improves both clarity and security posture.

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