Clean up dead code and fragile variable reference in LlamafileClient

[hobostay]

Summary

Two cleanups in LlamafileClient:

1. Remove redundant or None: In _resolve_reasoning, line 241 has return accumulated_content or None inside a block already guarded by if accumulated_content:. Since accumulated_content is guaranteed truthy at this point, the or None is dead logic that can never evaluate to None.

2. Replace fragile part reference with explicit bad_raw: In send_stream tool call parsing, the error fallback referenced part (the loop variable). This happened to be correct due to the break statement, but any future refactoring that removed or moved the break would silently reference the wrong tool call's arguments. Use an explicit bad_raw variable to capture the failing args at the point of failure.

Test plan

• Verify LlamafileClient streaming still works correctly
• Verify reasoning extraction still works
• Run existing test suite

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