Initial import

packages/domain/AGENTS.md

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+# AGENTS.md
+
+## Scope
+Applies within `packages/domain`.
+
+## Responsibilities
+- subscription lifecycle
+- billing cycle rules
+- quota ledger rules
+- generation orchestration
+- provider-key state transitions
+- admin and pairing policies
+
+## Rules
+- This package owns the business meaning of key states and retry decisions.
+- Do not hide exact quota from admins, but never expose exact quota to normal users.
+- A successful user request may have multiple provider attempts but may consume quota only once.