fix: accept zero-length Companion transcripts

crates/workspace-server/src/server.rs

@@ -24168,6 +24168,18 @@ mod tests {
 
         let companion_transcript = get_json(app.clone(), "/api/companion/transcript").await;
         assert_eq!(companion_transcript["total"], 0);
+        let empty_window = get_json(app.clone(), "/api/companion/transcript?start=0&limit=0").await;
+        assert_eq!(
+            empty_window,
+            json!({
+                "state": "stopped",
+                "start": 0,
+                "limit": 0,
+                "total": 0,
+                "next": null,
+                "items": [],
+            })
+        );
 
         let host_workers = get_json(app.clone(), &format!("/api/hosts/{host_id}/workers")).await;
         assert!(

web/workspace/src/lib/workspace/companion/api.test.ts

@@ -104,6 +104,24 @@ Deno.test("Companion transcript boundary accepts only bounded user-visible items
     ],
   };
   assertEquals(parseCompanionTranscriptProjection(fixture), fixture);
+  assertEquals(
+    parseCompanionTranscriptProjection({
+      state: "stopped",
+      start: 0,
+      limit: 0,
+      total: 0,
+      next: null,
+      items: [],
+    }),
+    {
+      state: "stopped",
+      start: 0,
+      limit: 0,
+      total: 0,
+      next: null,
+      items: [],
+    },
+  );
 
   assertThrows(
     () =>

web/workspace/src/lib/workspace/companion/api.ts

@@ -63,7 +63,7 @@ export function parseCompanionTranscriptProjection(
   ]);
   const start = boundedInteger(record.start);
   const limit = boundedInteger(record.limit);
-  if (limit < 1 || limit > MAX_TRANSCRIPT_ITEMS) {
+  if (limit > MAX_TRANSCRIPT_ITEMS) {
     throw new TypeError("Companion transcript limit is out of range");
   }
   const items = boundedArray(record.items, limit).map(parseTranscriptItem);