refactor: decouple Memory from asyncpg via StorageBackend protocol#3

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refactor/storage-backend-protocol

Commits on Apr 28, 2026

feat(backend): introduce StorageBackend protocol and PostgresBackend
Mearman
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refactor(memory): decouple Memory from asyncpg.Pool via StorageBackend
Mearman
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fix: add asserted_at support to StorageBackend protocol
Mearman
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