dsh-native-browser: A Native Browser Runtime for DeepSeek Harness

`dsh-native-browser` is a Chrome extension designed specifically for DeepSeek Harness (DSH), aiming to solve the state-loss problem caused by general-purpose approaches that require standalone browser instances. Using Manifest V3 and Native Messaging, it enables agents to operate on tabs within the user’s existing browser profile, preserving sessions and extensions. Core features include efficient semantic observation based on the accessibility tree, reliable operation and verification based on CDP, explicit tab ownership management, and visualized interaction and handoff mechanisms. It is currently in Public Alpha, requires manual environment setup, and has primary support for Chrome.