sx-tools: WASM kernel updates, TW/CSSX rework, content refresh, new debugging tools

Build tooling: updated OCaml bootstrapper, compile-modules, bundle.sh, sx-build-all.
WASM browser: rebuilt sx_browser.bc.js/wasm, sx-platform-2.js, .sxbc bytecode files.
CSSX/Tailwind: reworked cssx.sx templates and tw-layout, added tw-type support.
Content: refreshed essays, plans, geography, reactive islands, docs, demos, handlers.
New tools: bisect_sxbc.sh, test-spa.js, render-trace.sx, morph playwright spec.
Tests: added test-match.sx, test-examples.sx, updated test-tw.sx and web tests.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/render-trace.sx

@@ -0,0 +1,51 @@
+(define *render-trace* false)
+
+(define *render-trace-log* (list))
+
+(define *render-trace-depth* 0)
+
+(define
+  render-trace-reset!
+  (fn () (set! *render-trace-log* (list)) (set! *render-trace-depth* 0)))
+
+(define
+  render-trace-push!
+  (fn
+    (kind detail result)
+    (when
+      *render-trace*
+      (set! *render-trace-log* (append *render-trace-log* (list {:result (if (> (len (str result)) 80) (str (slice (str result) 0 77) "...") (str result)) :depth *render-trace-depth* :kind kind :detail detail}))))))
+
+(define
+  render-trace-enter!
+  (fn
+    (kind detail)
+    (when
+      *render-trace*
+      (render-trace-push! kind detail "...")
+      (set! *render-trace-depth* (+ *render-trace-depth* 1)))))
+
+(define
+  render-trace-exit!
+  (fn
+    (result)
+    (when
+      *render-trace*
+      (set! *render-trace-depth* (- *render-trace-depth* 1)))))
+
+(define
+  format-render-trace
+  (fn
+    ()
+    (join
+      "\n"
+      (map
+        (fn
+          (entry)
+          (let
+            ((indent (join "" (map (fn (_) "  ") (range 0 (get entry :depth)))))
+              (kind (get entry :kind))
+              (detail (get entry :detail))
+              (result (get entry :result)))
+            (str indent kind " " detail " → " result)))
+        *render-trace-log*))))