dsh-sandbox-escalation-fix: DeepSeek Harness Sandbox Upgrade Compatibility Plugin

`dsh-sandbox-escalation-fix` is a zero-configuration compatibility plugin for DeepSeek Harness, designed to resolve error and retry-loop issues caused by mismatched tool parameters when third-party models are used in All Access sessions. The plugin dynamically projects tool schemas to ensure that the tools visible to the model are consistent with its current sandbox mode and permissions, and supports Windows, Linux, and macOS. It is compatible with DSH 0.1.1 through 0.1.6-alpha.2. Since the issue has been mitigated in official releases, it is recommended to try the official behavior first and install the plugin only if stability remains unacceptable.