brownfield-drift

When to use

• Dev asks "are we following the architecture?" or "is this a valid change?"
• PR touches files near module boundaries or service interfaces
• Weekly architecture health check
• Any cross-service import was just added

When NOT to use

• "What does module X do?" → use brownfield-chat
• "What breaks if I change X?" → use brownfield-chat
• Graph coverage is low on a file → use brownfield-fix (it fills gaps before editing)
• No PLAN.md exists — drift requires machine-readable boundaries in PLAN.md