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This fixes the 'fn4 is not a function' error when the plugin is loaded by opencode (which runs on Bun).
The issue occurs because the generated JavaScript files from standard `tsc` contain extensionless relative imports (e.g. `import { ... } from "./lib/config"`), which breaks Node.js ESM module resolution requirements. It also breaks for the `jsonc-parser` dependency which ships an ESM build with the same issue.
By using `tsup` to bundle the project into a single `dist/index.js` file and inlining `jsonc-parser`, we eliminate all relative ESM import errors entirely while keeping the source code clean.
Fix plugin loading error ('fn4 is not a function') via bundling
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opencode node migration fixes and dep updates mostly