#199: GET /members returns its rows under "members", with "workers" kept as an alias

The endpoint became /members in the CB-634 rename but the body key stayed
"workers", so a caller that read "members" saw an empty fleet and reported
no members at all.

Emit the canonical "members" key. Keep "workers" as a deprecated alias so an
existing REST consumer keeps working - the out-of-band path a lead falls back
to when its MCP mount drops reads this endpoint.

The test now pins both keys and asserts they carry the same rows, so the alias
cannot silently drift. Watched failing without the fix:
"GET /members must return its rows under \"members\" ==> expected: not <null>"

fleetd/src/main/java/dev/ltms/fleet/rest/FleetApp.java

@@ -319,6 +319,12 @@ public final class FleetApp {
                 .map(s -> SessionManager.rosterView(s, live.get(s.terminalId())))
                 .toList();
         Map<String, Object> body = new LinkedHashMap<>();
+        // fleetd #199: the endpoint became /members in the CB-634 rename but the body key stayed
+        // "workers", so a caller that read "members" saw an empty fleet and reported no members at
+        // all. "members" is the canonical key; "workers" stays as a deprecated alias so an existing
+        // REST consumer keeps working — the out-of-band path a lead falls back to when its MCP mount
+        // drops reads this endpoint. Drop the alias once nothing reads it.
+        body.put("members", out);
         body.put("workers", out);
         // CB-586: operator visibility for the refs/wip snapshot store without shelling into the
         // repo — how many snapshot refs exist and roughly what they cost. Present only once a

fleetd/src/test/java/dev/ltms/fleet/rest/FleetAppTest.java

@@ -218,9 +218,17 @@ class FleetAppTest {
 
         HttpResponse<String> res = req(port, "GET", "/members");
         assertEquals(200, res.statusCode());
-        JsonNode workers = mapper.readTree(res.body()).get("workers");
-        assertEquals(1, workers.size());
-        JsonNode w = workers.get(0);
+        JsonNode body = mapper.readTree(res.body());
+        // fleetd #199: "members" is the canonical key. The endpoint is /members, so a caller that
+        // reads "members" must not see an empty fleet. "workers" is kept only as a deprecated alias
+        // and must carry the same rows — assert both, or the alias can silently drift.
+        JsonNode members = body.get("members");
+        assertNotNull(members, "GET /members must return its rows under \"members\"");
+        assertEquals(1, members.size());
+        JsonNode workers = body.get("workers");
+        assertNotNull(workers, "the deprecated \"workers\" alias is still emitted");
+        assertEquals(members, workers, "the alias must carry the same rows as \"members\"");
+        JsonNode w = members.get(0);
         assertEquals(spawned.get("terminalId").asText(), w.get("sessionId").asText());
         assertEquals(paneId, w.get("paneId").asText());
         assertEquals("ltms-local", w.get("profile").asText());