fix(pet): each user's pet tells only of their own sessions

An admin/analyst's pet counted every user's sessions (live, waiting, errors)
because their WebSocket carries everyone's. Server mode now marks their
session/agent/event frames `mine: true|false` (scope.broadcastAudience owners,
worked out once per broadcast), and GET /api/sessions?mine=1 lists only the
caller's own sessions (ownSessionWhere). The pet seeds from mine=1 and skips
frames marked mine: false. Developers and local mode are unchanged.

server/routes/sessions.js

@@ -160,6 +160,13 @@ router.get("/", (req, res) => {
     );
     params.push(Number(lane), Number(lane));
   }
+  // `mine=1` = the requesting user's OWN sessions whatever their role (the
+  // pet's count): an admin/analyst otherwise sees every user's. "1" locally.
+  if (req.query.mine === "1") {
+    const o = require("../lib/scope").ownSessionWhere(req, "s.id", "s.lane_id");
+    where.push(o.where);
+    params.push(...o.params);
+  }
   // `awaiting=1` = only sessions blocked on the user (an active session with
   // `awaiting_input_since`), the UI's "Waiting" filter, done before the limit.
   if (req.query.awaiting === "1") {