Fix tn93_args parameter handling in true_append

[stevenweaver]

Summary

• Fixed tn93_args parameter handling to support both string and list inputs
• Ensures true_append works correctly when called from both CLI and hivtrace.py

Problem

The run_tn93 function in true_append.py was not properly handling the tn93_args parameter when called programmatically from hivtrace.py. The previous implementation attempted to iterate over tn93_args and call .strip() on each element, which would fail when the parameter was passed as a list from hivtrace.py:544-547.

Solution

Added type checking to handle both interfaces:

• String input (from CLI): Splits on whitespace to create an argument list
• List input (from hivtrace.py): Converts all elements to strings

This ensures the subprocess command is built correctly regardless of how true_append is invoked.

Test plan

• Verified command building logic with both string and list inputs
• Confirmed existing test suite passes
• Tested that the fix handles edge cases (empty strings, mixed types in lists)

This fix resolves pipeline execution issues where tn93 arguments were not being properly passed when true_append was called as part of the hivtrace pipeline.

[stevenweaver]

Closing - this was addressing the wrong issue. Need to work on cawlign migration instead.