♻️ sync owner migration and facade thinning

src/queue_model/moon.pkg

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+///|

src/queue_model/pkg.generated.mbti

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+// Generated using `moon info`, DON'T EDIT IT
+package "Nanaloveyuki/BitLogger/src/queue_model"
+
+// Values
+
+// Errors
+
+// Types and methods
+pub(all) enum QueueOverflowPolicy {
+  DropNewest
+  DropOldest
+}
+
+// Type aliases
+
+// Traits
+

src/queue_model/policy.mbt

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+///|
+pub(all) enum QueueOverflowPolicy {
+  DropNewest
+  DropOldest
+}