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Write Markdown/MDX code fences that type-check, and debug ones that fail when they look correct. Load when authoring doc examples or fixing Kiira errors. Covers fence metadata (`ignore`, `validate`, `fixture`, `name`, `group`, `package`), grouping multi-fence walkthroughs and `defaultGroup: "file"`, fixtures for needed scope, `ts`->`tsx` mistags, unused-symbols and relative imports ignored by default, turning built-in rules on or off (`rules`, `--rule`), leading frontmatter not being parsed as Markdown, and never silencing a valid error with `ignore`.