CodeRabbit Generated Unit Tests: Add TypeScript CLI tests for GeminiCLI, index entry, simple mode

[coderabbitai]

Unit test generation was requested by @clduab11.

• Fix broken CLI install and implement comprehensive GitHub Actions workflow improvements #18 (comment)

The following files were modified:

• tests/unit/cli/gemini-cli.test.ts
• tests/unit/cli/index.test.ts
• tests/unit/cli/simple-index.test.ts

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