Fix async lifecycle ordering, add _spa_init boot phase, update to jqhtml _load_only/_load_render_only flags

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

node_modules/mdn-data/css/selectors.schema.json

@@ -19,7 +19,8 @@
         "enum": [
           "standard",
           "nonstandard",
-          "experimental"
+          "experimental",
+          "obsolete"
         ]
       },
       "mdn_url": {