dsh-approval-llm: Model Approval Plugin for DeepSeek Harness

`dsh-approval-llm` is a community plugin for DeepSeek Harness that provides an automated interim approval solution for agent workflows. It allows developers to enable automatic handling of tool call requests by an independent review model through specific presets. The plugin features a tri-directional decision mechanism (ALLOW/DENY/ESCALATE), along with circuit-breaker and failover-to-human strategies, and supports customizable parameters such as routing policies, timeouts, and allowlists via configuration files. Fundamentally, this plugin is a policy selection mechanism rather than a security guarantee, making it suitable for low-risk workflows where it provides a balance between full automation and manual approval.