fix: correct API key precedence and CODEOWNERS syntax

[aka1976mb]

Automated PR to address:

• Correct API key precedence in contentGenerator.ts
• Standardize CODEOWNERS syntax

[gemini-code-assist[bot]]

Summary of Changes

Hello @aka1976mb, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the configuration handling for API keys and Google Cloud project/location settings within the content generation module, ensuring correct precedence for API key loading and enabling more granular control for Vertex AI configurations. Additionally, it streamlines the CODEOWNERS file for better maintainability and clarity.

Highlights

• API Key Precedence: The logic for loading the geminiApiKey in contentGenerator.ts has been updated to prioritize the key provided in the configuration object (config.geminiApiKey) over environment variables and loaded API keys.
• CODEOWNERS Simplification: The .github/CODEOWNERS file has been simplified by removing specific file-based review requirements, retaining only the default maintainer assignment for all files.
• Google Cloud Project/Location Support: Added support for googleCloudProject and googleCloudLocation within the ContentGeneratorConfig and ensured these values are passed to the GoogleGenAI client when Vertex AI is utilized.

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[bdmorgan]

Hi @aka1976mb, thank you so much for your contribution to Gemini CLI! We really appreciate the time and effort you've put into this.

We're making some updates to our contribution process to improve how we track and review changes. Please take a moment to review our recent discussion post: Improving Our Contribution Process & Introducing New Guidelines.

Key Update: Starting January 26, 2026, the Gemini CLI project will require all pull requests to be associated with an existing issue. Any pull requests not linked to an issue by that date will be automatically closed.

Thank you for your understanding and for being a part of our community!