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1452c81941
Introduces MemoryProvider ABC, MemoryManager orchestrator, and BuiltinMemoryProvider for the existing MEMORY.md/USER.md system. Key design decisions: - Built-in memory is ALWAYS active, never disabled by external providers - Multiple providers can be active simultaneously - Prefetch results from all providers are merged per-turn - Sync fans out to all providers after each turn - Each provider can expose its own tools Three registration paths: 1. Built-in (BuiltinMemoryProvider) — always first, not removable 2. First-party (Honcho stays as-is for now, migration in follow-up) 3. Plugin — ctx.register_memory_provider() in plugin system Files: - agent/memory_provider.py — ABC with core + optional lifecycle hooks - agent/memory_manager.py — orchestrator, single integration point - agent/builtin_memory_provider.py — wraps existing MemoryStore - hermes_cli/plugins.py — register_memory_provider() + accessor - run_agent.py — MemoryManager wired alongside existing Honcho code - tests/agent/test_memory_provider.py — 37 tests This establishes the interface for all pending memory backend PRs (#1811 Hindsight, #2732 RetainDB, #2933 Mem0, #3499 Byterover, #3369 OpenViking, #2351 Holographic, #727 Cognitive) to implement as plugins rather than one-off integrations.