fix: disable symlink following in indexer to prevent path traversal #13
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This prevents indexing files outside the project directory if malicious symlinks are present. Uses .follow_links(false) in WalkBuilder.
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Description
This PR addresses a security vulnerability where �grep's indexer would follow symbolic links by default, potentially allowing an attacker to index sensitive files outside the project directory (e.g. /etc/passwd).
Changes
Verification
Fixes #64 in bounty-challenge.