dsh-modelprint: Request Fingerprinting and Drift Detection Plugin for DeepSeek Harness

`dsh-modelprint` is a lightweight plugin for DeepSeek Harness (DSH) that detects configuration drift. It generates a "fingerprint" by normalizing request parameters and uses the `modelprint_check` tool to compare the current configuration against a local pin file. The plugin is dependency-free and supports verifying the consistency of the Provider, Model ID, sampling parameters, and tool list in CI/CD and local development, helping developers confirm that request assembly behaves as expected.