fix(extension): skip Antigravity ghost sessions in Fallback 2 to prevent trajectory not found infinite loop

extension/src/step-probe.ts

@@ -275,6 +275,18 @@ function setupMonitor() {
                                 }
                             } catch (e: any) {
                                 if (pollCount <= 30) ctx.logToFile(`[POLL] Fallback 2 error for sid=${sid}: ${e.message}`);
+                                // If trajectory explicitly does not exist, it might be an Antigravity or non-Cascade session directory.
+                                if (e.message?.includes('trajectory not found')) {
+                                    continue;
+                                }
+                                // FIXED: known-issues "AI Response Missing for New Sessions" -> Force register to prevent session loss on proto/UTF-8 parse errors
+                                allTraj.trajectorySummaries[sid] = {
+                                    status: 'CASCADE_RUN_STATUS_RUNNING',
+                                    stepCount: 1, // Assume progressing to allow loop delta>0 trigger
+                                    lastModifiedTime: new Date(brainDirs[i].time).toISOString(),
+                                    summary: 'Discovered via brain/ scan (Fallback Error)',
+                                    trajectoryMetadata: { workspaces: [{ workspaceFolderAbsoluteUri: ctx.workspaceUri.replace(/\\/g, '/') }] }
+                                };
                             }
                         }
                     }
@@ -772,6 +784,8 @@ function setupMonitor() {
                                 ctx.logToFile(`[STEP-PROBE] UTF-8 offset also failed: ${oe.message?.substring(0, 100)}`);
                                 ctx.stallProbed = true; // permanent error — block retry loop; resets on delta>0
                             }
+                        } else {
+                            ctx.stallProbed = true; // Not a UTF-8 error (e.g. trajectory not found), prevent infinite loop
                         }
                     }
                 }