dsh-anchored-subagent: The “Passphrase” Patch for DeepSeek Subagents

`dsh-anchored-subagent` is a DeepSeek Harness plugin designed to resolve inconsistent subagent startup states. Using a “secret code” mechanism, it forces the main agent and subagent to start with a Minimal condition (only `bash` and `str_replace_editor`) on the first request, ensuring the model follows the optimal RL trajectory. After the first persistent tool call, the plugin automatically unlocks the full tool directory. It supports custom persona handling and allows flexible control of bootstrap behavior through a configuration file, making it suitable for complex workflows that require stable subagent behavior.