test(a2a-server): migrate process.env to vi.stubEnv() per GEMINI.md conventions

[aniruddhaadak80]

Fixes #19826

Replaced direct \process.env\ modifications with \�i.stubEnv()\ and \�i.unstubAllEnvs()\ in \packages/a2a-server/src/commands/init.test.ts\ and \packages/a2a-server/src/http/app.test.ts, following the guidelines in GEMINI.md.

[github-actions]

📊 PR Size: size/S

• Lines changed: 15
• Additions: +10
• Deletions: -5
• Files changed: 2

[gemini-code-assist]

Summary of Changes

Hello, 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 updates the test suite for the a2a-server package to align with project standards for environment variable handling. By utilizing Vitest's built-in stubbing utilities, the changes improve test reliability and prevent side effects caused by direct manipulation of the global process.env object.

Highlights

• Environment Variable Management: Replaced direct modifications of process.env with Vitest's vi.stubEnv() and vi.unstubAllEnvs() to ensure environment variable isolation during tests.
• Test Lifecycle Cleanup: Added vi.unstubAllEnvs() to afterEach hooks in test files to prevent environment pollution between test cases.

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[gemini-code-assist]

Code Review

This pull request refactors the test files init.test.ts and app.test.ts in packages/a2a-server to follow the repository's testing conventions for environment variables. Specifically, direct modifications to process.env are replaced with vi.stubEnv and vi.unstubAllEnvs() to prevent test leakage. There are no review comments, and I have no feedback to provide.