<critical_constraints> ✅ MUST use standard ADR format ✅ MUST include: Title, Context, Decision, Consequences ✅ MUST auto-number files (001, 002, etc.) </critical_constraints>
<when_to_use>
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Tech stack change (e.g., "Switch to Tailwind")
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Design pattern adoption
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Major dependency added/removed
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Structural codebase change </when_to_use>