fix(yaml/tag): prevent yaml role=tag from being stripped & generalize

data-config

src/cli/completions/block-scanner.ts

@@ -56,12 +56,16 @@ export function parseBlockAttrs(info: string): BlockAttrs {
  * Defaults:
  *   - role is set, no explicit as → "none" (strip — it's metadata)
  *   - role=spark-table → "md-table" (render as md-table directive)
+ *   - role=tag → "codeblock" (kept for the marked yaml-tag extension)
  *   - no role, no as → "codeblock" (keep as visible code block)
  */
 export function resolveBlockAs(role: string | undefined, as: string | undefined): string {
   if (as) return as;
   // spark-table blocks render as md-table by default
   if (role === "spark-table") return "md-table";
+  // yaml-defined tag blocks must survive stripping so the
+  // code-block-yaml-tag marked extension can render them
+  if (role === "tag") return "codeblock";
   if (role) return "none";
   return "codeblock";
 }