GHSA-q9p7-wqxg-mrhc: Langroid: Sandbox Escape to Remote Code Execution via Incomplete `eval()` Mitigation in TableChatAgent

Langroid's TableChatAgent and VectorStore have a critical vulnerability where they use Python's `eval()` function to execute code generated by the AI, but fail to properly sandbox it. Even though they pass an empty dictionary for local variables, Python automatically includes built-in functions like `__import__()` in the execution environment, allowing an attacker to run arbitrary commands on the host system through prompt injection (tricking the AI into generating malicious code).