fix(core): add case-insensitive flag to system grep strategy

[Anjaligarhwal]

Fixes #24955

What

The GrepTool uses three cascading search strategies. The git grep strategy uses --ignore-case and the JS fallback uses RegExp(pattern, 'i'), but the system grep strategy was missing the -i flag — making it case-sensitive on non-git repos where system grep is available.

Fix

Add -i to the system grep args array at line 467, consistent with the other two strategies and with the ripGrep.ts implementation (which already uses --ignore-case).

Tests

• All 32 grep.test.ts tests pass
• Lint and prettier pass via pre-commit hooks
• TypeScript has zero errors on this file

[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 addresses an inconsistency in the GrepTool's search strategies by enabling case-insensitive matching for the system grep implementation. This ensures that search behavior remains predictable and uniform across different environments, regardless of whether a git repository is present.

Highlights

• System Grep Strategy: Added the -i flag to the system grep command arguments to ensure case-insensitive searches.
• Consistency: Aligned the system grep strategy behavior with the existing git grep and JS fallback strategies.

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[github-actions]

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[gemini-code-assist]

Code Review

This pull request updates the grep command arguments in packages/core/src/tools/grep.ts to include the -i flag, enabling case-insensitive searching. I have no further feedback to provide as there are no review comments to address.