🔒 Fix Command Injection in Git Operations

[ishaanxgupta]

🎯 What: The _run_git function in src/scanner/git_ops.py took user-controlled strings (like repository URLs or branch names) and placed them directly into git CLI commands without validation or delimiting. If a user provided an argument like --upload-pack=malicious as a repository URL, Git would interpret it as a command option instead of a positional argument. This commit adds a validation step (_validate_no_options) to prevent string arguments starting with - from reaching the git command, and explicitly appends -- for git clone to separate options from positional arguments correctly.

⚠️ Risk: Left unfixed, an attacker could achieve arbitrary code execution or disclose repository secrets on the system running this pipeline by manipulating branch names or repository URLs passed to the clone_repo or pull_latest functions.

🛡️ Solution:

1. Implemented a _validate_no_options helper that checks if user-supplied strings begin with - and raises a ValueError if so.
2. Hardened the git clone command in clone_repo to append -- right before the positional arguments (repo_url and local_path). (Note: -- was specifically avoided in git pull and git checkout as they misinterpret it due to how those commands parse pathspecs/refs).
3. Added robust unit tests verifying both successful commands and correct rejection of injection payloads.

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PR created automatically by Jules for task 12344443644230307895 started by @ishaanxgupta

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