Add a0-llmfallback plugin

[Nunezchef]

Summary

• adds new index entry: plugins/a0-llmfallback/plugin.yaml
• points to standalone plugin repo: https://github.com/Nunezchef/a0-llmfallback

Validation

• follows index schema (title, description, github, tags)
• one plugin folder added in this PR

[frdel]

Hello, I need to warn you that this approach to plugins will soon break. Plugins are self-contained, there is no need for manual install and uninstall scripts and cloning git repos at runtime will be flagged as dangerous by our scanner. Extensions, tools, prompts etc. should be contained in the plugin directly.

[Nunezchef]

Thanks for the warning, I really appreciate it.

I’m still pretty new to the Agent Zero plugin architecture, so I took a patch/installer path to get something working quickly. I understand now that this is not the long-term model and that runtime cloning/manual install scripts will be
treated as unsafe.

I’ll rework this into a fully self-contained plugin package with all extensions/tools/prompts included directly, and no manual install/uninstall flow.

If you can point me to the recommended structure/reference plugin for the current self-contained model, I’ll align to that so I don’t repeat this mistake.