Two-tier memory subsystem — short-term working storage, long-term pattern lookup, and security

Notes & tips

• Depend on the documented public surface. The supported API is UnifiedMemory, MemoryConfig, and the security/loader classes re-exported from attune.memory, plus the MemoryBackend / SearchableMemoryBackend protocols from attune.memory.backend. Submodule internals (mixins/, short_term/, long_term_*) may change.
• Let classification run. Keep auto_classify=True unless you have a reason to set the level yourself.
• Check capabilities, don't assume. Use get_capabilities() / supports_*() before relying on real-time or cross-process behavior.
• Close when done. Call close() (or save()) to flush and release the backend.