00caad18bf
* feat: add `mermaid` preset Problem: no built-in support for compiling mermaid diagrams via `mmdc`. Solution: add a `mermaid` preset that compiles `.mmd` files to SVG and parses `Parse error on line N` diagnostics from stderr. Add `mermaid-cli` to the nix dev shell. * refactor(presets): simplify `mermaid` error parser Problem: the inline `mermaid` error_parser looped over every line and used the `Parse error on line N:` header as the message, losing the useful `Expecting ..., got ...` token detail. Solution: extract `parse_mermaid` alongside the other parse functions, use a single `output:match` (mermaid's JISON parser stops at the first error), and surface the `Expecting ..., got ...` line as the message. * ci: format * ci: format |
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