chore: prune unnecessary code (automated weekly cleanup)

[Miyamura80]

This PR removes commented-out code from utils/llm/dspy_langfuse.py that is not used.
It strictly follows UNNECESSARY_CODE_GUIDELINE.md and only removes dead code that is safely identified as unused, leaving required Pydantic settings methods and test fixtures in place.

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PR created automatically by Jules for task 14415639592093320777 started by @Miyamura80

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Summary by cubic

Pruned commented-out dead code in utils/llm/dspy_langfuse.py to keep the file clean and reduce maintenance noise. No behavior or API changes.

• Refactors
  • Removed commented cache_read_input_tokens fields and an unused status message update in on_lm_end.
  • Followed UNNECESSARY_CODE_GUIDELINE.md; left Pydantic settings and test fixtures intact.

^{Written for commit ac77f91. Summary will update on new commits.}

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[cubic-dev-ai]

No issues found across 1 file

_{Tip: cubic could auto-approve low-risk PRs like this, if it thinks it's safe to merge. Learn more}