fix(create-plugin): fix typo in scaffolded agent md templates

[tolzhabayev]

Summary

• Fix "Thie" → "This" typo in scaffolded CLAUDE.md, AGENTS.md, and GEMINI.md templates

[github-actions]

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[Copilot]

Pull request overview

Fixes a typo in the create-plugin scaffolded agent documentation templates so newly generated plugins don’t start with an incorrect word.

Changes:

• Corrects “Thie” → “This” in the scaffolded GEMINI.md template.
• Corrects “Thie” → “This” in the scaffolded CLAUDE.md template.
• Corrects “Thie” → “This” in the scaffolded AGENTS.md template.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/create-plugin/templates/common/GEMINI.md	Fixes a typo in the Gemini agent template text.
packages/create-plugin/templates/common/CLAUDE.md	Fixes a typo in the Claude agent template text.
packages/create-plugin/templates/common/AGENTS.md	Fixes a typo in the AGENTS template text.