SXC content: docs/examples/home/reference pages + SX testing runner

New sxc/ content tree with 120 page files across docs, examples, home,
and reference demos. sx/sx/testing/ adds page-runner.sx (317L) and
index-runner.sx (394L) — SX-native test runner pages for
browser-based evaluation.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

sx/sxc/examples/pp-form-full.sx

@@ -0,0 +1,41 @@
+(defcomp
+  (&key name email role)
+  (form
+    :sx-put "/sx/(geography.(hypermedia.(example.(api.putpatch))))"
+    :sx-target "#pp-target"
+    :sx-swap "innerHTML"
+    (~tw :tokens "space-y-3")
+    (div
+      (label (~tw :tokens "block text-sm font-medium text-stone-700 mb-1") "Name")
+      (input
+        :type "text"
+        :name "name"
+        :value name
+        (~tw :tokens "w-full px-3 py-2 border border-stone-300 rounded text-sm")))
+    (div
+      (label (~tw :tokens "block text-sm font-medium text-stone-700 mb-1") "Email")
+      (input
+        :type "text"
+        :name "email"
+        :value email
+        (~tw :tokens "w-full px-3 py-2 border border-stone-300 rounded text-sm")))
+    (div
+      (label (~tw :tokens "block text-sm font-medium text-stone-700 mb-1") "Role")
+      (input
+        :type "text"
+        :name "role"
+        :value role
+        (~tw :tokens "w-full px-3 py-2 border border-stone-300 rounded text-sm")))
+    (div
+      (~tw :tokens "flex gap-2")
+      (button
+        :type "submit"
+        (~tw :tokens "px-4 py-2 bg-violet-600 text-white rounded text-sm hover:bg-violet-700")
+        "Save All (PUT)")
+      (button
+        :type "button"
+        :sx-get "/sx/(geography.(hypermedia.(example.(api.putpatch-cancel))))"
+        :sx-target "#pp-target"
+        :sx-swap "innerHTML"
+        (~tw :tokens "px-4 py-2 bg-stone-200 text-stone-700 rounded text-sm hover:bg-stone-300")
+        "Cancel"))))