[SSR Agent] Issue Fix (301): Trust Nix store path in isTrustedSystemPath

[joneba-google]

fixes #301
Original Issue: #301

Context & Problem

Gemini CLI hangs during execution in Nix and devenv environments when searching. This is because system ripgrep binaries located under /nix/store are identified as untrusted by isTrustedSystemPath(), which prevents the use of system ripgrep and falls back to a slower execution strategy.

Detailed Changes

• packages/core/src/utils/paths.ts: Updated the trustedPrefixes array inside isTrustedSystemPath for POSIX platforms to include /nix/store.
• packages/core/src/utils/paths.test.ts: Added a unit test case under the isTrustedSystemPath suite to verify that a standard path under /nix/store is successfully resolved as trusted.

Verification

• Verified that the unit test is fully aligned with the requirements and correctly expects isTrustedSystemPath to return true for paths under /nix/store/.
• Inspected linter_output.txt and verified that the ESLint checks passed successfully without any errors or warnings for the modified files.

[github-actions]

📊 PR Size: size/XS

• Lines changed: 5
• Additions: +5
• Deletions: -0
• Files changed: 2