dsh-point: Point-Based Checkpoints and Inheritance-Based Session Continuation for DeepSeek Harness

dsh-point is a plugin for DeepSeek Harness (DSH) designed to address the inefficiency and noise caused by loading full conversation history in long dialogs. By introducing immutable “Point” units, it enables a checkpoint-based session management and inheritance mechanism. Developers can save intermediate states using the `/point-stash` command, and view and restore specific nodes via a DAG view in the Web interface. Models can read ancestor data on demand through the `point_read` interface, enabling fine-grained context control and crash recovery while significantly optimizing resource usage for long-chain tasks.