feat: add checkpoint system (LangGraph-inspired)#39
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- CheckpointStore: persistent SQLite storage - CheckpointManager: thread-based isolation, interrupt/resume - Thread ID format: tenant:user:workflow (multi-tenant) - interrupt_before mechanism for dangerous steps - Checkpoint history tracking - 11 new tests (70 total passing)
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Description
Add checkpoint system inspired by LangGraph's architecture.
Key Design Decisions (from LangGraph)
Features
Testing