fix: make AmpThreadSummary env/relationships optional for API resilience

Co-authored-by: Amp <amp@ampcode.com>

Author: jom-sq

server/lib/amp-api.ts

@@ -150,12 +150,12 @@ export interface AmpThreadSummary {
   archived: boolean;
   creatorUserID: string;
   usesDtw: boolean;
-  env: {
-    initial: {
-      trees: AmpThreadTree[];
+  env?: {
+    initial?: {
+      trees?: AmpThreadTree[];
     };
   };
-  relationships: Array<{
+  relationships?: Array<{
     type: string;
     role: 'parent' | 'child';
     threadID: string;

server/lib/threadProvider.ts

@@ -49,14 +49,13 @@ export async function listAllThreads(): Promise<Thread[]> {
 }
 
 function toThread(s: AmpThreadSummary): Thread {
-  const trees = s.env.initial.trees;
-  const tree = trees[0];
+  const tree = s.env?.initial?.trees?.[0];
   const repoUrl = tree?.repository?.url;
 
   // Extract handoff relationships
   let handoffParentId: string | null = null;
   const handoffChildIds: string[] = [];
-  for (const rel of s.relationships) {
+  for (const rel of s.relationships ?? []) {
     if (rel.type === 'handoff') {
       if (rel.role === 'child') {
         handoffParentId = rel.threadID;