fix(extension): diff_review 2-strategy deploy + 8s pending delay

- Deploy AcknowledgeCascadeCodeEdit RPC strategy (was in source but never compiled)
- Add 8s setTimeout delay for diff_review pending (AI response arrives on Discord first)
- Capture closure variables for delayed pending creation safety
- known-issues: diff_review pending ordering fix

extension/src/extension.ts

@@ -2401,25 +2401,38 @@ function setupMonitor() {
             // ── Diff review detection: if session just went IDLE and files were modified ──
             if (wasRunning && !isRunning && pendingModifiedFiles.length > 0) {
                 const fileList = pendingModifiedFiles.slice(0, 5).join(', ');
-                logToFile(`[DIFF-REVIEW] IDLE with ${pendingModifiedFiles.length} modified files: ${fileList}`);
-                writeChatSnapshot(`📝 **코드 리뷰 대기**\n\n수정된 파일: ${fileList}\n\nAG에서 Accept all / Reject all로 확인해주세요.`);
-                writePendingApproval({
-                    conversation_id: activeSessionId,
-                    command: `코드 리뷰: ${fileList}`,
-                    description: `${pendingModifiedFiles.length}개 파일이 수정되었습니다`,
-                    step_type: 'diff_review',
-                    step_index: currentCount,
-                    source: 'diff_review_detect',
-                    buttons: [
-                        { text: 'Accept all', index: 0 },
-                        { text: 'Reject all', index: 1 },
-                    ],
-                    modified_files: pendingModifiedFilePaths.slice(0, 20),
-                    edit_step_indices: pendingEditStepIndices.slice(0, 20),
-                } as any);
-                pendingModifiedFiles = []; // reset after notification
+                const fileCount = pendingModifiedFiles.length;
+                // Capture variables for delayed closure (poll loop may change them)
+                const capturedSessionId = activeSessionId;
+                const capturedStepCount = currentCount;
+                const capturedModFiles = pendingModifiedFilePaths.slice(0, 20);
+                const capturedEditSteps = pendingEditStepIndices.slice(0, 20);
+                logToFile(`[DIFF-REVIEW] IDLE with ${fileCount} modified files: ${fileList}`);
+                // Reset tracking arrays immediately (so next session starts fresh)
+                pendingModifiedFiles = [];
                 pendingModifiedFilePaths = [];
                 pendingEditStepIndices = [];
+                // Delay diff_review pending by 8s so AI response snapshot arrives
+                // on Discord before the approval buttons (snapshot scanner needs time
+                // to relay the response text to Discord ahead of the approval embed)
+                setTimeout(() => {
+                    logToFile(`[DIFF-REVIEW] deferred pending creation (8s) for: ${fileList}`);
+                    writeChatSnapshot(`📝 **코드 리뷰 대기**\n\n수정된 파일: ${fileList}\n\nAG에서 Accept all / Reject all로 확인해주세요.`);
+                    writePendingApproval({
+                        conversation_id: capturedSessionId,
+                        command: `코드 리뷰: ${fileList}`,
+                        description: `${fileCount}개 파일이 수정되었습니다`,
+                        step_type: 'diff_review',
+                        step_index: capturedStepCount,
+                        source: 'diff_review_detect',
+                        buttons: [
+                            { text: 'Accept all', index: 0 },
+                            { text: 'Reject all', index: 1 },
+                        ],
+                        modified_files: capturedModFiles,
+                        edit_step_indices: capturedEditSteps,
+                    } as any);
+                }, 8000);
             }
             wasRunning = isRunning;
         } catch (e: any) {