dsh-flash-godmode: V4 Flash God Mode for DeepSeek Harness

`dsh-flash-godmode` is a DeepSeek Harness (DSH) plugin designed to address the instability of the V4 Flash model in `reasoning: max` mode, including overthinking on simple tasks, underthinking on complex tasks, and a tendency to diverge. By combining w7 persona anchoring, complexity-guided dispatch, and first-turn tool anchoring, it transforms unstable reasoning into reproducible capabilities. It leverages the `agent/inbox/spliced` event to ensure first-turn guidance takes effect, automatically routing simple and complex tasks based on task length or architecture keywords. The plugin provides a stable and reliable Flash-model solution for automated tasks in headless scenarios.