fix(extension): Retry auto-approve 흐름 복구 + Observer 형제 탐색 + thinking 필터링 (v0.5.79)

- WS response 파일에 _from_ws 마커 추가하여 processResponseFile 삭제 방지
- extractContextFromNearby에 sibling 탐색 추가 (AG Native DOM 구조 대응)
- thinking 블록 (max-h-[200px]) 필터링으로 내부 사고 릴레이 차단
- DOM 탐색 depth 5→10 확대 + pre.font-mono 우선 탐색
- 사용자 메시지 셀렉터 (.select-text.rounded-lg) 추가

extension/src/approval-handler.ts

@@ -205,6 +205,17 @@ async function processResponseFile(filePath: string) {
         }
         const content = fs.readFileSync(filePath, 'utf-8');
         const resp = JSON.parse(content);
+
+        // v22: Skip files written by the WS response handler (extension.ts onResponse).
+        // Those files exist ONLY for Observer's pollResponseGroup to read via HTTP.
+        // The WS handler already calls tryApprovalStrategies, so processing here is redundant.
+        // Without this skip, the watcher deletes the file before Observer can poll it
+        // (since no pending file exists for the isDomObserver check).
+        if (resp._from_ws) {
+            ctx.logToFile(`[RESPONSE] SKIP _from_ws file (for Observer pollResponseGroup): ${resp.request_id}`);
+            return;
+        }
+
         const msg = `[RESPONSE] rid=${resp.request_id} approved=${resp.approved} step_type=${resp.step_type || '(missing)'} keys=[${Object.keys(resp).join(',')}]`;
         console.log(`Gravity Bridge: ${msg}`);
         ctx.logToFile(msg);