10c - adfToPlainMarkdown and plainMarkdownToAdf exported, whitespace-only leaves trimmed at a line end

src/index.ts

@@ -2,5 +2,7 @@ export type { AdfAttributes, AdfDocument, AdfMark, AdfNode } from './adf/documen
 export type { ConvertError, ConvertErrorCode, ConvertErrorPath, ParseError, Result, SourcePosition } from './result.ts'
 export type { JsonValue } from './json-value.ts'
 export { adfToMarkdown } from './markdown/emit/adf-to-markdown.ts'
+export { adfToPlainMarkdown } from './markdown/emit/plain-reduction.ts'
 export { isAdfDocument } from './adf/document.ts'
 export { markdownToAdf } from './markdown/parse/markdown-to-adf.ts'
+export { plainMarkdownToAdf } from './markdown/parse/plain-lift.ts'