hermes-sdk-matrix-lib-breaking-change-pickle-to-sqlite

Hermes SDK v0.9.0 includes a breaking change in its Matrix library: session state storage migrated from pickle to SQLite. This migration has no automated rollback path and is not cherry-pick-safe — it touches the storage layer across multiple modules. Any upgrade to v0.9.0 requires explicit pre-migration state export and post-migration validation before the upgrade is considered safe.

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