feat: add OpenMemory as optional memory backend

[devin-ai-integration]

Summary

This PR implements OpenMemory as a pluggable storage backend for CrewAI memory, addressing issue #4039. OpenMemory is a local-first persistent memory engine for AI applications.

The implementation follows the existing Mem0Storage pattern and includes:

• New OpenMemoryStorage class implementing the Storage interface
• Registration of "openmemory" provider in ExternalMemory
• Optional dependency openmemory-py>=1.0.0
• Comprehensive unit tests with mocked OpenMemory SDK

Configuration options supported: path, tier (fast/smart/deep/hybrid), embeddings, user_id.

Usage Example

from crewai.memory.external.external_memory import ExternalMemory

embedder_config = {
    "provider": "openmemory",
    "config": {
        "path": "/path/to/memory.sqlite",  # optional, defaults to CREWAI_STORAGE_DIR
        "tier": "fast",                     # fast, smart, deep, or hybrid
        "embeddings": {"provider": "synthetic"},
        "user_id": "my_user",               # optional, for namespacing
    },
}

storage = ExternalMemory.create_storage(crew, embedder_config)

Review & Testing Checklist for Human

• Verify OpenMemory SDK API compatibility: The implementation assumes add(content, userId=..., tags=..., metadata=...) and query(query, k=..., filters=...) signatures based on SDK documentation. Test with actual openmemory-py package to confirm.
• Check metadata mutation in save(): Line 87 does metadata.pop("tags", None) which mutates the input dict - verify this is acceptable behavior or if a copy should be made.
• Validate search result normalization: The search() method normalizes results assuming OpenMemory returns dicts with "content" or "memory" fields - confirm this matches actual SDK behavior.
• Test reset() behavior: The reset deletes the SQLite file and reinitializes - verify this works correctly with the real SDK.

Recommended test plan: Install openmemory-py, create an ExternalMemory with provider: "openmemory", and verify save/search/reset operations work end-to-end.

Notes

• All tests use mocks since the real OpenMemory SDK wasn't available in the test environment
• The implementation only supports mode="local" (no remote mode yet)
• Search results return a list of dicts with content, optional score, and metadata fields

Link to Devin run: https://app.devin.ai/sessions/49cdb1ae10014912a0b2bf6e679a28eb
Requested by: João (joao@crewai.com)

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