fix: preamble-hoist's section splitter closes a fence only on a bare delimiter (ship Step 11)

Inside an open fence, a line such as "```bash" is content in CommonMark,
but splitSections treated it as the closing fence, so a later "## " line in
the same block could split a section mid-code-block and hoist half of it.
A closing delimiter now needs nothing but whitespace after it. Every host's
render is unchanged (gen-skill-docs --dry-run FRESH on all twelve hosts).

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

scripts/resolvers/preamble-hoist.ts

@@ -35,10 +35,10 @@ function splitSections(text: string, marker = '## '): string[] {
   let current: string[] = [];
   let fence: string | null = null;
   for (const line of text.split('\n')) {
-    const delimiter = /^ {0,3}(`{3,}|~{3,})/.exec(line)?.[1];
+    const [, delimiter, info] = /^ {0,3}(`{3,}|~{3,})(.*)$/.exec(line) ?? [];
     if (delimiter) {
       if (!fence) fence = delimiter;
-      else if (delimiter[0] === fence[0] && delimiter.length >= fence.length) fence = null;
+      else if (delimiter[0] === fence[0] && delimiter.length >= fence.length && !info.trim()) fence = null;
     } else if (!fence && line.startsWith(marker) && current.some(l => l.trim())) {
       sections.push(current.join('\n').trim());
       current = [];