v2.7.0

Added

• MemoryProvider abstraction — Introduced MemoryBackend ABC (devsper/memory/providers/base.py) mirroring the LLMBackend pattern. All memory backends implement a unified async interface: store, retrieve, delete, list_memory, list_all_ids, query_similar, health.
• MemoryProvider factory — get_memory_provider() singleton factory resolves the active backend from config ([memory] provider), DEVSPER_MEMORY_PROVIDER env var, or legacy backend field. Defaults to Vektori (pgvector) with automatic SQLite fallback when DATABASE_URL is not set.
• Snowflake memory backend — New SnowflakeBackend using VECTOR(FLOAT, 1536) columns and VECTOR_COSINE_SIMILARITY for native semantic search. Credentials resolved exclusively via the devsper credential store or SNOWFLAKE_* env vars — never from config files.
• SQLite, Redis, Vektori, Platform backends — Existing stores wrapped as MemoryBackend implementations with get_sync_store() escape hatch for legacy sync callers.
• Credential store: Snowflake + Redis — Added snowflake and redis_memory providers to keyring mappings. devsper credentials set snowflake password stores the Snowflake password securely; inject_into_env() propagates all SNOWFLAKE_* vars automatically.
• Config schema — Added RedisMemoryConfig and SnowflakeMemoryConfig sub-models under [memory]. SnowflakeMemoryConfig has no password field — credentials are credential-store-only.
• devsper doctor memory provider health check — run_doctor() now calls provider.health() and reports the active backend name and status.
• devsper[snowflake] and devsper[redis-memory] extras — snowflake-connector-python>=3.6.0 and redis>=5.0.0 optional dependency groups.
• deregister(name) in tool registry — Public function to remove a single tool by name without clearing the whole registry.
• MemoryIndex native search delegation — When the active backend has supports_native_vector_search=True, query_memory() and query_across_runs() delegate directly to backend.query_similar(), bypassing in-process cosine ranking.

Changed

• MemoryRouter and MemoryIndex accept an optional backend: MemoryBackend parameter. The _build_memory_store() fallback now calls the factory instead of constructing MemoryStore() directly.
• get_effective_memory_store() preserved as a backwards-compatible alias; new get_effective_memory_backend() returns the full MemoryBackend. Async-only backends (Vektori, Snowflake) are bridged via _AsyncBridgeStore for sync callers.
• Legacy backend values (local, supermemory, hybrid) now map to "vektori" as the default production store.

Fixed

• test_pipelines.py — Replaced registry._tools.pop() (broken module-level access) with new deregister() function.
• test_e2e_redis_loop.py — Import guard prevents ModuleNotFoundError when redis is not installed; test now correctly skips instead of failing.

Full Changelog: v2.6.0...v2.7.0