plugin structure

Signed-off-by: Dmytro Stanchiev <git@dmytros.dev>

.opencode/INSTALL.md

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+# Installing tmux-utils for OpenCode
+
+## Installation
+
+Add the plugin to the `plugin` array in your `opencode.json`:
+
+```json
+{
+  "plugin": ["tmux-utils"]
+}
+```
+
+If you install directly from git instead of a registry, use the git URL in that same array entry.
+
+Restart OpenCode after updating the config.
+
+## Usage
+
+This plugin provides:
+
+- the `interactive_bash` tool for tmux-backed interactive sessions
+- tmux subagent pane management tied to OpenCode session lifecycle events
+
+## Configuration
+
+Plugin configuration is loaded from standard OpenCode config locations for this project and user environment.

.opencode/plugins/tmux-utils.js

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+export { default } from "../../dist/index.js"