Function finalize_tool_call 

fn finalize_tool_call(
    body: &str,
    out: &mut ParserOutput,
    mint_id: impl FnMut() -> String,
)

Parse the accumulated tool-call body and push the resulting ToolCall (or a NormalizationError) onto out.

Two body shapes are accepted, in order:

1. JSON — {"name":"foo","arguments":{...}} (Qwen2/2.5 native).
2. Inner XML — <function=NAME><parameter=KEY>VAL</parameter>...</function> (Qwen3 + --jinja, Hermes-style).

JSON is tried first because it is the historical Qwen format and is unambiguous; the XML form is the documented fallback for Qwen3 chat templates that emit nested function/parameter markup inside <tool_call>.