🛡️ Sentinel: [CRITICAL] Fix command injection in git utilities

[google-labs-jules]

This PR fixes a critical command injection vulnerability in src/utils/git.ts where user inputs (such as search queries) were being concatenated directly into shell command strings. By switching to execFile and passing arguments as an array, we prevent the shell from interpreting metacharacters in the input.

Vulnerability:
exec(\git log --grep="${query}"`)allows executing arbitrary commands ifquerycontains shell separators like;`.

Fix:
Changed to execFile('git', ['log', '--grep=' + query]).

Verification:
Updated unit tests in src/utils/__tests__/git.spec.ts to verify that execFile is called with the correct array of arguments.

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PR created automatically by Jules for task 17536709473318556814 started by @kratos06

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Summary by cubic

Fixes a critical command injection in git utilities by switching from child_process.exec to execFile with safe argument arrays. This blocks shell metacharacters from being executed and hardens all git-related commands.

• Bug Fixes
  • Replaced exec with execFile in src/utils/git.ts for log, show, status, diff, rev-parse, and version checks.
  • Updated unit tests to mock execFile and assert correct argument arrays.
  • Added a security note in .jules/sentinel.md.

^{Written for commit 8f87b22. Summary will update on new commits.}

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