fix(core): ignore .gemini folder by default in file search

[Rajeev91691]

This PR adds .gemini to the list of default ignored directories in loadIgnoreRules (Issue #28826).

When running the tool within workspaces that contain the .gemini configuration directory (e.g. running in user's home directory), chokidar filesystem watchers and workspace crawlers attempt to index internal directories. This causes spurious file discovery events, indexing delays, and warnings when short-lived runtime lockfiles (like projects.json.lock) are created and deleted quickly.

Adding .gemini to default ignored directories resolves this. Added unit tests in packages/core/src/utils/filesearch/ignore.test.ts to ensure .gemini is always excluded.

[gemini-code-assist]

Summary of Changes

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This pull request improves file discovery performance and stability by ensuring that the .gemini configuration directory is ignored by default. This change prevents workspace crawlers and filesystem watchers from indexing internal files within .gemini, which previously caused performance overhead and false warnings in environments where this directory is present.

Highlights

• Ignore .gemini directory: Added .gemini to the default list of ignored directories in the file search utility to prevent unnecessary indexing and spurious file events.
• Unit testing: Added a new test case in ignore.test.ts to verify that the .gemini directory is correctly excluded by the file discovery service.

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[github-actions]

📊 PR Size: size/S

• Lines changed: 13
• Additions: +12
• Deletions: -1
• Files changed: 2

[gemini-code-assist]

Code Review

This pull request updates the file search utility to always include '.gemini' in the list of ignored directories, ensuring it is excluded from file discovery by default. A unit test has also been added to verify this behavior. There are no review comments, and I have no feedback to provide.