fix(tests): drop stray docstring + duplicate imports to silence ruff E402

The Gemma 4 parser tests were appended below the existing
test_hf_tokenizer_config_str_to_chat_formatter, with their own module-
level docstring and re-imports of json / llama_cpp.llama_chat_format
that ruff flagged as E402 (module-level import not at top of file).

Both imports are already at lines 1 and 9 respectively, so deleting the
duplicate block is a no-op for the runtime behaviour. The orientation
note that used to live in the stray docstring is preserved as an inline
comment block above the new test functions.

Author: Anai-Guo

tests/test_llama_chat_format.py

@@ -92,16 +92,6 @@ def test_hf_tokenizer_config_str_to_chat_formatter():
     )
 
     assert chat_formatter_respoonse.prompt == ("<s>[INST] Hello, world! [/INST]</s>")
-"""Append-only test module for Gemma 4 native tool-call parsing.
-
-These tests intentionally exercise only the pure-Python parser
-(`_parse_gemma4_native_tool_calls`) so they run without a real GGUF
-model and without llama.cpp linkage.
-"""
-
-import json
-
-import llama_cpp.llama_chat_format as llama_chat_format
 
 
 def _parse(text):