fix: add comment to sandbox context check for clarity

- Add descriptive comment before sandbox availability check
- Matches pattern used in other working file tools
- Preparing to fix type resolution issue where sandbox resolves to unknown

Co-Authored-By: Dallin Bentley <dallinbentley98@gmail.com>

packages/ai/src/tools/file-tools/bash-execute-tool.ts

@@ -42,6 +42,7 @@ const executeBashCommands = wrapTraced(
     }
 
     try {
+      // Check if sandbox is available in runtime context
       const sandbox = runtimeContext.get(SandboxContextKey.Sandbox);
 
       if (sandbox) {