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* test(runtime): cover the driver suffix in sync and store DSNs * fix(runtime): strip the SQLAlchemy driver suffix from sync and store DSNs With `postgres_url: postgresql+asyncpg://...` and the default empty `postgres_schema`, the sync checkpointer, the sync store and the async store passed the DSN to psycopg's `from_conn_string` unchanged, and libpq cannot parse the `+asyncpg` scheme. `dsn_with_search_path` only drops the suffix when it adds a schema, so a non-empty schema hid the bug. The async checkpointer already calls `normalize_libpq_dsn` first. Call `normalize_libpq_dsn` at these three call sites as well. * refactor(persistence): drop the driver suffix inside dsn_with_search_path dsn_with_search_path dropped a SQLAlchemy `+driver` suffix only when it added a search_path, so every libpq caller had to wrap the DSN in normalize_libpq_dsn to cover an empty schema, and flattening that nesting later would bring the bug back. Normalize at the top of dsn_with_search_path so both paths drop the suffix and check the scheme in one place, and remove the outer call from its five callers. The sync checkpointer and both stores are back to their code on main.