dsh-llm-governor: A Multi-Model Governance Plugin for DeepSeek Harness

The `dsh-llm-governor` is a plugin for DeepSeek Harness (DSH) designed to address issues in multi-model deployments, such as fragmented routing, quota management, and auditability. It provides model profiling, user access control, monthly Credits, multiple routing strategies, failure rerouting, and audit capabilities. Operating as a decision layer alongside DSH, it does not proxy requests or manage credentials. It supports routing modes such as Auto and quality-first, and can be integrated and installed as a plugin for deployments that require fine-grained management and multi-tenant scenarios.