fix: recursively load all parent .env files to support global configu…

[oodenough]

Summary

Fix recursive .env loading to prevent local files from obscuring global configuration (e.g., ~/.gemini/.env).

Details

• Modified findEnvFiles to recursively search parent directories up to home.
• Switched to multiple .env file loading with override: false to allow inheritance.
• Fixed authentication issues by ensuring global credentials are not obscured by local .env.

Related Issues

Fixes #14688
Fixes #13840

How to Validate

• Modified findEnvFiles to recursively search parent directories up to home.
• Switched to multiple .env file loading with override: false to allow inheritance.
• Fixed authentication issues by ensuring global credentials are not obscured by local .env.

Pre-Merge Checklist

• Updated relevant documentation and README (if needed)
• Added/updated tests (if needed)
• Noted breaking changes (if any)
• Validated on required platforms/methods:
  • MacOS
    • npm run
    • npx
    • Docker
    • Podman
    • Seatbelt
  • Windows
    • npm run
    • npx
    • Docker
  • Linux
    • npm run
    • npx
    • Docker

[gemini-code-assist]

Summary of Changes

Hello @oodenough, I'm Gemini Code Assist¹! 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 addresses a critical issue where local .env files could inadvertently override or obscure global configuration settings, leading to authentication failures. By modifying the environment loading mechanism, the system now recursively discovers all relevant .env files from the current working directory up to the user's home directory. These files are then loaded in a way that allows for proper inheritance, ensuring that global configurations are respected and local settings only augment or refine them without causing conflicts.

Highlights

• Recursive .env loading: The system now recursively searches parent directories up to the user's home directory for .env files, including ~/.gemini/.env.
• .env file inheritance: Multiple .env files are now loaded with override: false, ensuring that global configurations are not obscured by local settings and allowing for proper inheritance.
• Authentication fix: This change resolves authentication issues by correctly prioritizing global credentials over local .env variables, preventing unintended overrides.

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[gemini-code-assist]

Code Review

This pull request implements recursive loading of .env files, enabling hierarchical configuration and inheritance of global settings, by changing findEnvFile to findEnvFiles and loading multiple files with override: false. While no specific security vulnerabilities were identified in the general review, a bug was found in the new findEnvFiles function that can lead to duplicate .env file paths from the home directory. Suggestions have been provided to fix this using a Set for deduplication.