Answer the architecture review: emit-only spellings move down, and the tables drop markdown's words

src/markdown/block-directive-arguments.ts

@@ -0,0 +1,11 @@
+import type { BlockType } from '../adf/block-directives.ts'
+
+const blockArguments: Readonly<Record<string, string>> = {
+  blockTaskItem: 'state',
+  panel: 'panelType',
+  taskItem: 'state',
+} satisfies Partial<Record<BlockType, string>>
+
+export function blockArgument(type: string): string | undefined {
+  return blockArguments[type]
+}