Handles cases where a stray backtick opens an inline code span but is never closed.
Previously, any subsequent XML tool tag was treated as inside markdown code and ignored.
Now, tool tags are detected after an unclosed backtick, and the markdown state is reset
when the backtick is confirmed to be literal text at stream boundaries.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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