Adapts PR #1811 (Hindsight by benfrank241) and PR #2933 (Mem0 by
kartik-mem0) to the MemoryProvider interface as drop-in plugins.
Hindsight plugin (plugins/hindsight-memory/):
- 3 tools: hindsight_retain, hindsight_recall, hindsight_reflect
- Cloud (API key) or local (embedded PostgreSQL) modes
- Background prefetch with thread isolation for aiohttp
- Auto-sync turns to knowledge graph
Mem0 plugin (plugins/mem0-memory/):
- 4 tools: mem0_profile, mem0_search, mem0_context, mem0_conclude
- Server-side LLM fact extraction and deduplication
- Semantic search with optional reranking
- Verbatim fact storage via conclude (infer=False)
Both require API keys (HINDSIGHT_API_KEY / MEM0_API_KEY) and the
respective SDK packages (hindsight-client / mem0ai). is_available()
gates on credentials so installing the plugin without a key is safe.
