init: 클린 기반 auth 서버 설계

domain/AGENTS.md

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+# domain AGENTS
+
+Role:
+- express domain meaning and invariants only
+- own entity, value object, domain policy, domain exception
+
+Allowed:
+- entity
+- value object
+- domain service
+- invariant check
+- domain exception
+
+Forbidden:
+- Spring/JPA/Servlet/HTTP/Jackson
+- ResponseEntity/status code/API response shape
+- repository/client implementations
+- MDC/log context
+- string-formatted time generation
+
+Rules:
+- prefer expressive types over raw strings
+- invariants must be enforced at creation/state-change boundary
+- domain exception expresses domain meaning only
+- domain must run without web/persistence framework
+- keep time as type, not formatted string
+
+Read first:
+- `/docs/architecture/README.md`
+- `/docs/standards/design/value-object.md`
+- `/docs/standards/design/dto-domain-entity-separation.md`
+- `/docs/standards/language/null.md`
+- `/docs/standards/language/time.md`
+- `/docs/standards/language/collections-immutability.md`
+- `/docs/standards/language/exceptions.md`
+- `/docs/standards/language/javadoc.md`
+
+Examples:
+- `/docs/examples/design/value-object.md`
+- `/docs/examples/language/null.md`
+- `/docs/examples/language/time.md`
+- `/docs/examples/language/collections-immutability.md`
+- `/docs/examples/language/exceptions.md`