Set up project scaffold: Bun/OpenCode plugin with registry pattern

- AGENTS.md adapted from taskgraph for this Bun/TypeScript plugin
- Dual MIT/Apache-2.0 licenses
- Package.json, tsconfig, biome config following open-memory pattern
- Skeleton src/ with registry-pattern tasks tool (help operation working)
- Opencode.json plugin config
- .gitignore for dist, node_modules, lockb
- Remove typo .gitingore files, proper .gitignore in .opencode/

src/index.ts

@@ -0,0 +1,10 @@
+import type { Plugin } from "@opencode-ai/plugin";
+import { createTools } from "./tools.js";
+
+const OpenTasksPlugin: Plugin = async (ctx) => {
+  return {
+    tool: createTools(ctx),
+  };
+};
+
+export default OpenTasksPlugin;