Following PRI-737 investigation, add two rules to skills/safety/SKILL.md:
1. Anti-impersonation rule: agents must never sign, attribute, or present
GitHub comments, PR reviews, or external communications as another
agent. Every comment must accurately identify the authoring agent.
2. Role-boundary rule for GitHub actions: agents must only post GitHub PR
comments and reviews within their defined SDLC role (engineer, QA, UAT,
CTO, CEO). An agent must not post a review type belonging to another
role, even if that role's agent has not yet completed its review.
Co-Authored-By: Paperclip <noreply@paperclip.ing>