docs(sdlc): merge group heading rows across the full table width

scripts/sdlc-delivery/render-sdlc.mjs

@@ -71,13 +71,18 @@ function renderTable(lines, className = '') {
   const hasSeparator = isSeparator(rows[1] ?? []);
   const align = hasSeparator ? columnAlignment(rows[1]) : header.map(() => '');
   const data = hasSeparator ? rows.slice(2) : rows.slice(1);
+  // A row with only its first cell filled is a group heading (CR01, SR06, UN04,
+  // WP 1.0 …): it spans the full width and does not size the columns. Signature
+  // tables keep their blank cells for signing.
+  const isGroup = (row) => className !== 'signature-table' && header.length >= 3
+    && Boolean(row[0]) && row.slice(1).every((cell) => !cell);
 
   // A column whose longest cell is short (IDs, dates, counts, statuses) is
   // marked "tight" so auto table layout shrinks it to its content instead of
   // handing every column an equal share of the page width.
   const widest = header.map((_, column) => Math.max(
     (header[column] ?? '').length,
-    ...data.map((row) => (row[column] ?? '').replace(/[`*]/g, '').length)
+    ...data.filter((row) => !isGroup(row)).map((row) => (row[column] ?? '').replace(/[`*]/g, '').length)
   ));
   const classFor = (column) => [
     align[column] ?? '',
@@ -89,7 +94,9 @@ function renderTable(lines, className = '') {
     return `<${tag}${attr ? ` class="${attr}"` : ''}>${renderInline(cell)}</${tag}>`;
   }).join('');
   const classes = [className, header.length >= 8 ? 'dense' : ''].filter(Boolean).join(' ');
-  return `<table${classes ? ` class="${classes}"` : ''}><thead><tr>${cells('th', header)}</tr></thead><tbody>${data.map((row) => `<tr>${cells('td', row)}</tr>`).join('')}</tbody></table>`;
+  return `<table${classes ? ` class="${classes}"` : ''}><thead><tr>${cells('th', header)}</tr></thead><tbody>${data.map((row) => isGroup(row)
+    ? `<tr class="group"><td colspan="${header.length}">${renderInline(row[0])}</td></tr>`
+    : `<tr>${cells('td', row)}</tr>`).join('')}</tbody></table>`;
 }
 
 function renderParagraph(lines) {