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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>