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- SDLC.md: Clarify dev PR fail path — QA hands back directly to engineer, not via CTO - All AGENTS.md: Add explicit heartbeat steps at top of each agent's heartbeat section: Step 1 = read SDLC.md + TOOLS.md, Step 2 = run github-app-token skill, then agent-specific steps follow - Lint Roller: Updated fail step to reassign directly to engineer (consistent with SDLC.md clarification) Co-Authored-By: Paperclip <noreply@paperclip.ing>