fix(observer): ensure inline script injection before </body> for Electron execution + add BEACON diagnostic ping

- html-patcher: relocate inline script from after </html> to before </body>
- html-patcher: clean up duplicate </html> tags from previous bad insertions
- observer-script: add immediate BEACON fetch to /ping on script load
- http-bridge: add diagnostic request logging for non-polling endpoints
- devlog 003: crash recovery session notes

extension/src/observer-script.ts

@@ -12,6 +12,13 @@ export function generateApprovalObserverScript(_port: number): string {
   function log(m){console.log('[GB Observer] '+m);}
   log('v8 Script loaded — Full-DOM AG Native Parser');
 
+  // DIAGNOSTIC BEACON: immediate POST to confirm script execution in renderer
+  try {
+    fetch('http://127.0.0.1:${_port}/ping?beacon=1&t='+Date.now())
+      .then(function(r){log('BEACON ping OK: '+r.status);})
+      .catch(function(e){log('BEACON ping FAIL: '+e.message);});
+  } catch(e){ log('BEACON error: '+e); }
+
   // React-Compatible Synthetic Clicker
   function dispatchReactClick(el){
     if (!el) return;