dsh-plugin-opencode-usage: OpenCode Go Subscription Usage Floating Panel

The OpenCode Go usage plugin for DeepSeek Harness (DSH) adds a floating entry in the Web sidebar to display the usage and reset times for rolling, weekly, and monthly subscription quotas. The plugin provides an independent floating button panel that refreshes automatically and can be closed using the keyboard or by clicking outside. The API key is parsed only by the local host process, ensuring security. Installation requires configuring credentials and restarting; it works with the DSH Web profile in Node.js environments but does not support headless mode.