Add Chat Comments plugin

[omar-nahhas]

Adds plugins/chat_comments/index.yaml + thumbnail.

Select text in a chat message to attach Google-Docs-style comments. Comments highlight inline, persist with the chat across reloads and chat switches, can be edited or deleted, and can all be sent to the prompt box in one go.

• Repo: https://github.com/agent-zero-plugins/agent-zero-plugin-chat-comments (public, Apache-2.0)
• Root plugin.yaml has name: chat_comments, matching the folder name
• Thumbnail: 512x512 PNG, 2751 bytes

[a0-bot]

Plugin submission validation failed

ERROR: GitHub API request failed (404) GET https://api.github.com/repos/agent-zero-plugins/agent-zero-plugin-chat-comments/contents/plugin.yaml: {"message":"Not Found","documentation_url":"https://docs.github.com/rest/repos/contents#get-repository-content","status":"404"}

[chatgpt-codex-connector]

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Reviewed commit: 9690072473

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[chatgpt-codex-connector]

Point at a repo with root plugin.yaml

The linked repository currently does not expose plugin.yaml at its repository root; its manifest is under usr/plugins/chat_comments/plugin.yaml. The PR validator dereferences https://api.github.com/repos/{owner}/{repo}/contents/plugin.yaml and fails with “github repository must contain plugin.yaml at repository root”, so this entry will not pass validation or become installable until the remote repo adds a root manifest or this URL points at a repo that has one.

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