Add open-plan-annotator to awesome-ai-plugins? #12

Hey, open-plan-annotator is a plugin that opens your agent's plan in a browser UI where you can strikethrough or replace steps and send the feedback back for revision.

We maintain awesome-ai-plugins. Would you be up for adding open-plan-annotator with a PR? You can edit the README directly.

Suggested entry:

- [open-plan-annotator](https://github.com/ndom91/open-plan-annotator) - Local plugin that intercepts agent plan mode and opens a browser annotation UI for reviewing and revising plans.

Submission guidelines.