Merge origin/main, discarding Scrubs's SDLC fix commit
Keep this branch's SDLC content (cartsnitch-aligned structure). Drop adff13f's changes — registry should remain ghcr.io, engineer self-merges to dev, and tool-deviation policy stays at board approval. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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