Wire island hydration into post-swap lifecycle

- orchestration.sx: post-swap calls sx-hydrate-islands for new islands
  in swapped content, plus process-emit-elements for data-sx-emit
- Regenerate sx-ref.js

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

shared/static/scripts/sx-ref.js

@@ -14,7 +14,7 @@
   // =========================================================================
 
   var NIL = Object.freeze({ _nil: true, toString: function() { return "nil"; } });
-  var SX_VERSION = "2026-03-08T11:14:47Z";
+  var SX_VERSION = "2026-03-08T11:17:09Z";
 
   function isNil(x) { return x === NIL || x === null || x === undefined; }
   function isSxTruthy(x) { return x !== false && !isNil(x); }
@@ -2138,6 +2138,7 @@ return postSwap(target); });
   var postSwap = function(root) { activateScripts(root);
 sxProcessScripts(root);
 sxHydrate(root);
+sxHydrateIslands(root);
 return processElements(root); };
 
   // activate-scripts

shared/sx/ref/orchestration.sx

@@ -432,6 +432,7 @@
     (activate-scripts root)
     (sx-process-scripts root)
     (sx-hydrate root)
+    (sx-hydrate-islands root)
     (process-elements root)))