chore: prune unnecessary code (automated weekly cleanup)

- Removed commented-out block for `status_message` in `utils/llm/dspy_langfuse.py` (line 352). Evidence: It is a block of commented-out code.
- Reviewed vulture findings and confirmed they are all false positives per UNNECESSARY_CODE_GUIDELINE.md.

Co-authored-by: Miyamura80 <38335479+Miyamura80@users.noreply.github.com>

Author: google-labs-jules[bot]

utils/llm/dspy_langfuse.py

@@ -349,7 +349,6 @@ def on_lm_end(  # noqa
                 log.warning(
                     f"Missing required information for full usage/cost calculation: {', '.join(missing_info_elements)}"
                 )
-                # status_message = (status_message + "; " if status_message else "") + f"Missing info for cost calc: { ', '.join(missing_info_elements)}"
 
         # --- Finalize Span ---
         if span: