stopSequences constant
Stop sequences a caller passes to generation.
<|im_end|> ends every turn (it is also the model's EOS). A tool-call
turn emits <|tool_call_start|>…<|tool_call_end|> and then <|im_end|>,
so stopping here captures the whole call block intact.
Implementation
static const List<String> stopSequences = <String>[imEnd];