feat: gate a run of blocks to chosen output formats

wap/src/wml.rs

@@ -77,6 +77,9 @@ fn block_markup(block: &Block, settings: &PageSettings, out: &mut String) {
         Block::Rule => out.push_str("<p>---</p>\n"),
         // Alignment is a fixed-width concern; a handset lays out its own screen.
         Block::Aligned { block, .. } => block_markup(block, settings, out),
+        // Gates are filtered out before rendering; keeping the content is the
+        // harmless reading if one ever arrives here.
+        Block::Gated { block, .. } => block_markup(block, settings, out),
         // Pagination here is the deck's own job, driven by the byte budget.
         Block::CardBreak { .. } => {}
         // Raw HTML is not WML and would not parse on a handset.

wap/src/xhtmlmp.rs

@@ -112,6 +112,9 @@ fn self_block(block: &Block, out: &mut String) {
         // Alignment reaches only the fixed-width text formats. Pagination is a
         // WML concern; a browser scrolls one document.
         Block::Aligned { block, .. } => self_block(block, out),
+        // Gates are filtered out before rendering; keeping the content is the
+        // harmless reading if one ever arrives here.
+        Block::Gated { block, .. } => self_block(block, out),
         Block::CardBreak { .. } => {}
     }
 }