gemma-4 GGUF finetunes emit a corrupted tool-call scheme that broke both
extraction and display, e.g.:
  <|tool_call>call:bash{command:<|"|>wc -l README.md<|"|>}<tool_call|><|tool_response>…

Three distinct corruptions, all now handled by normalize_gemma_tool_tokens():
- <|"|>  is the model's stand-in for a " quote — it leaked verbatim into string
  args, so a bash command became <|"|>wc -l<|"|> and failed with
  "syntax error near unexpected token |". Restored to a real ".
- malformed open/close markers <|tool_call> / <tool_call|> (vs the canonical
  <|tool_call|>) — stripped, so the native call:NAME{…} body parses and the
  markers don't leak as text. The canonical <|tool_call|> / <|tool_call_end|>
  are deliberately left intact so Phi-style parsing is unaffected.
- a hallucinated <|tool_response>…/<turn|> tail (the model fakes the tool result)
  — stripped, and strip_tool_calls_from_content now also drops response:NAME{…}
  spans so the fake result never reaches the user or gets executed.

Wired into ModelParserAdapter + ToolCallParser (extract & strip) and
cleanup_control_tokens, covering the streaming, non-streaming and fallback paths.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011DDv7BchtZQWsnPG6Jm49m