Fixes#7952 — Matrix E2EE completely broken after mautrix migration.
- Replace MemoryCryptoStore + pickle/HMAC persistence with mautrix's
PgCryptoStore backed by SQLite via aiosqlite. Crypto state now
persists reliably across restarts without fragile serialization.
- Add handle_sync() call on initial sync response so to-device events
(queued Megolm key shares) are dispatched to OlmMachine instead of
being silently dropped.
- Add _verify_device_keys_on_server() after loading crypto state.
Detects missing keys (re-uploads), stale keys from migration
(attempts re-upload), and corrupted state (refuses E2EE).
- Add _CryptoStateStore adapter wrapping MemoryStateStore to satisfy
mautrix crypto's StateStore interface (is_encrypted,
get_encryption_info, find_shared_rooms).
- Remove redundant share_keys() call from sync loop — OlmMachine
already handles this via DEVICE_OTK_COUNT event handler.
- Fix datetime vs float TypeError in session.py suspend_recently_active()
that crashed gateway startup.
- Add aiosqlite and asyncpg to [matrix] extra in pyproject.toml.
- Update test mocks for PgCryptoStore/Database and add query_keys mock
for key verification. 174 tests pass.
- Add E2EE upgrade/migration docs to Matrix user guide.
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