fix: fallback chain for step retrieval (5 method+field combos)

extension/out/extension.js

@@ -304,13 +304,30 @@ function activate(context) {
                 return;
             }
             const trajId = current.trajectoryId;
-            // Fetch actual steps to detect changes
-            const stepsResult = await lsRPC('GetCascadeTrajectorySteps', {
-                trajectoryId: trajId,
-            });
-            if (isFirstPoll && stepsResult) {
-                console.log(`Gravity Bridge: [LS] steps response keys: ${typeof stepsResult === 'object' ? Object.keys(stepsResult).join(', ') : typeof stepsResult}`);
-                console.log(`Gravity Bridge: [LS] steps sample: ${JSON.stringify(stepsResult).substring(0, 800)}`);
+            // Try multiple RPC methods and field name variants
+            const attempts = [
+                { method: 'GetCascadeTrajectorySteps', params: { trajectoryId: trajId } },
+                { method: 'GetCascadeTrajectory', params: { trajectoryId: trajId } },
+                { method: 'GetCascadeTrajectorySteps', params: { cascadeId: trajId } },
+                { method: 'GetCascadeTrajectory', params: { cascadeId: trajId } },
+                { method: 'GetUserTrajectory', params: { trajectoryId: trajId } },
+            ];
+            let stepsResult = null;
+            for (const attempt of attempts) {
+                const res = await lsRPC(attempt.method, attempt.params);
+                if (res && !res.code && !res.message?.includes('not found')) {
+                    stepsResult = res;
+                    if (isFirstPoll) {
+                        console.log(`Gravity Bridge: [LS] ✅ ${attempt.method}(${JSON.stringify(attempt.params).substring(0, 50)}) worked!`);
+                        console.log(`Gravity Bridge: [LS] steps response keys: ${Object.keys(res).join(', ')}`);
+                        console.log(`Gravity Bridge: [LS] steps sample: ${JSON.stringify(res).substring(0, 800)}`);
+                    }
+                    break;
+                }
+                if (isFirstPoll) {
+                    const errMsg = res?.message || res?.code || 'null/empty';
+                    console.log(`Gravity Bridge: [LS] ❌ ${attempt.method}(${Object.keys(attempt.params)[0]}): ${errMsg}`);
+                }
             }
             if (!stepsResult) {
                 return;