* parsers/ministral: fix nested tool call parsing by counting brace nesting
* fix lint error
* parsers: refactor ministral parser
The old one was very tied to expecting to see only one token at a time,
which I don't like to assume (who knows what the future might hold wrt
speculative decoding, etc). This new one follows a similar structure to
qwen3-coder's parser, which incidentally makes it easier to test as well
(since we can test the individual events that come out when given
particular inputs).
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Co-authored-by: Devon Rifkin <drifkin@drifkin.net>
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