Fix shellscript angle arg

[mahi656]

Problem

• Shell script syntax highlighting was incorrect when unquoted arguments contained angle brackets (e.g., pfinfo <file>).

• The root cause was that the argument_context entry in the shellscript grammar did not include a name property.

• Without this property, the highlighter could not assign the correct scope, causing incorrect or inconsistent token highlighting.

This issue is tracked in #1020.

• Fix

• The missing name property was added to argument_context, allowing unquoted arguments to be correctly scoped as string.unquoted.argument.shell.

Result

• • Angle bracket arguments are now highlighted correctly

• • Highlighting behavior is consistent across themes

• • Shell script grammar behaves as expected

Fixes #1020

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