Validate a single extracted block and return its diagnostics with absolute
coordinates. Both syntax errors (severity error) and semantic warnings
(severity warning) are returned; consumers filter by severity as needed
(e.g. markdownlint surfaces only errors; remark/textlint add warnings in
strict mode).
Validate a single extracted block and return its diagnostics with absolute coordinates. Both syntax errors (severity
error) and semantic warnings (severitywarning) are returned; consumers filter by severity as needed (e.g. markdownlint surfaces only errors; remark/textlint add warnings in strict mode).