fix: plugin name in README differs from what Claude says is available

[JohnWeidner]

Description

Is the plugin name supposed to be very-good-ai-flutter-plugin or vgv-ai-flutter-plugin?

README says one thing. Claude thinks something else.

Steps To Reproduce

1. Follow the installation steps in the README file.
   /plugin marketplace add VeryGoodOpenSource/very_good_claude_marketplace
   /plugin install vgv-ai-flutter-plugin@very_good_claude_marketplace

Expected Behavior

README and Claude should match

Additional Context

No response

[JohnWeidner]

@jorgecoca Do we need to rename these github repos???