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>

hosts/ocaml/browser/bisect_sxbc.sh

@@ -0,0 +1,105 @@
+#!/bin/bash
+# bisect_sxbc.sh — Binary search for which .sxbc file breaks reactive rendering.
+# Runs test_wasm.sh with SX_TEST_BYTECODE=1, toggling individual files between
+# bytecode and source to find the culprit.
+set -euo pipefail
+
+cd "$(dirname "$0")/../../.."
+
+SXBC_DIR="shared/static/wasm/sx"
+BACKUP_DIR="/tmp/sxbc-bisect-backup"
+
+# All .sxbc files in load order
+FILES=(
+  render core-signals signals deps router page-helpers freeze
+  bytecode compiler vm dom browser
+  adapter-html adapter-sx adapter-dom
+  cssx boot-helpers hypersx
+  harness harness-reactive harness-web
+  engine orchestration boot
+)
+
+# Backup all sxbc files
+mkdir -p "$BACKUP_DIR"
+for f in "${FILES[@]}"; do
+  cp "$SXBC_DIR/$f.sxbc" "$BACKUP_DIR/$f.sxbc" 2>/dev/null || true
+done
+
+# Test function: returns 0 if the reactive scoped test passes
+test_passes() {
+  local result
+  result=$(SX_TEST_BYTECODE=1 bash hosts/ocaml/browser/test_wasm.sh 2>&1) || true
+  if echo "$result" | grep -q "scoped static class"; then
+    # Test mentioned = it failed
+    return 1
+  else
+    return 0
+  fi
+}
+
+# Restore all bytecodes
+restore_all() {
+  for f in "${FILES[@]}"; do
+    cp "$BACKUP_DIR/$f.sxbc" "$SXBC_DIR/$f.sxbc" 2>/dev/null || true
+  done
+}
+
+# Remove specific bytecodes (force source loading for those)
+remove_sxbc() {
+  for f in "$@"; do
+    rm -f "$SXBC_DIR/$f.sxbc"
+  done
+}
+
+echo "=== Bytecode bisect: finding which .sxbc breaks reactive rendering ==="
+echo "    ${#FILES[@]} files to search"
+echo ""
+
+# First: verify all-bytecode fails
+restore_all
+echo "--- All bytecode (should fail) ---"
+if test_passes; then
+  echo "UNEXPECTED: all-bytecode passes! Nothing to bisect."
+  exit 0
+fi
+echo "  Confirmed: fails with all bytecode"
+
+# Second: verify all-source passes
+for f in "${FILES[@]}"; do rm -f "$SXBC_DIR/$f.sxbc"; done
+echo "--- All source (should pass) ---"
+if ! test_passes; then
+  echo "UNEXPECTED: all-source also fails! Bug is not bytecode-specific."
+  restore_all
+  exit 1
+fi
+echo "  Confirmed: passes with all source"
+
+# Binary search: find minimal set of bytecode files that causes failure
+# Strategy: start with all source, add bytecode files one at a time
+echo ""
+echo "=== Individual file test ==="
+culprits=()
+for f in "${FILES[@]}"; do
+  # Start from all-source, add just this one file as bytecode
+  for g in "${FILES[@]}"; do rm -f "$SXBC_DIR/$g.sxbc"; done
+  cp "$BACKUP_DIR/$f.sxbc" "$SXBC_DIR/$f.sxbc"
+
+  if test_passes; then
+    printf "  %-20s bytecode OK\n" "$f"
+  else
+    printf "  %-20s *** BREAKS ***\n" "$f"
+    culprits+=("$f")
+  fi
+done
+
+# Restore
+restore_all
+
+echo ""
+if [ ${#culprits[@]} -eq 0 ]; then
+  echo "No single file causes the failure — it's a combination."
+  echo "Run with groups to narrow down."
+else
+  echo "=== CULPRIT FILE(S): ${culprits[*]} ==="
+  echo "These .sxbc files individually cause the reactive rendering to break."
+fi