Phase 7f: universal page descriptor + render plan visibility

defpage is already portable: server executes via execute_page(),
client via try-client-route. Add render plan logging to client
routing so console shows boundary decisions on navigation:
"sx:route plan pagename — N server, M client"

Mark Phase 7 (Full Isomorphism) as complete:
- 7a: affinity annotations + render-target
- 7b: page render plans (boundary optimizer)
- 7e: cross-host isomorphic testing (61 tests)
- 7f: universal page descriptor + visibility

7c (optimistic updates) and 7d (offline data) remain as future work.

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

shared/static/scripts/sx-browser.js

@@ -14,7 +14,7 @@
   // =========================================================================
 
   var NIL = Object.freeze({ _nil: true, toString: function() { return "nil"; } });
-  var SX_VERSION = "2026-03-07T23:59:03Z";
+  var SX_VERSION = "2026-03-08T00:10:07Z";
 
   function isNil(x) { return x === NIL || x === null || x === undefined; }
   function isSxTruthy(x) { return x !== false && !isNil(x); }
@@ -2059,6 +2059,14 @@ return domAppendToHead(link); }, domQueryAll(container, "link[rel=\"stylesheet\"
   return (isSxTruthy(isNil(target)) ? (logWarn((String("sx:route target not found: ") + String(targetSel))), false) : (isSxTruthy(!isSxTruthy(depsSatisfied_p(match))) ? (logInfo((String("sx:route deps miss for ") + String(pageName))), false) : (function() {
   var ioDeps = get(match, "io-deps");
   var hasIo = (isSxTruthy(ioDeps) && !isSxTruthy(isEmpty(ioDeps)));
+  var renderPlan = get(match, "render-plan");
+  if (isSxTruthy(renderPlan)) {
+  (function() {
+  var srv = sxOr(get(renderPlan, "server"), []);
+  var cli = sxOr(get(renderPlan, "client"), []);
+  return logInfo((String("sx:route plan ") + String(pageName) + String(" — ") + String(len(srv)) + String(" server, ") + String(len(cli)) + String(" client")));
+})();
+}
   if (isSxTruthy(hasIo)) {
   registerIoDeps(ioDeps);
 }