data(client): update msgpack fixtures and golden files for protocol v13

Regenerate all msgpack test fixtures with tell_state and follow_state
fields. Update golden proof_room snapshot. Adjust serialization and
bridge tests for new ObserverSnapshot fields.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/tests/golden/proof_room_tick_10.json

@@ -38,6 +38,7 @@
       "z": 0
     }
   ],
+  "follow_state": null,
   "game_time": {
     "day": 0,
     "day_phase": "Morning",
@@ -48,7 +49,7 @@
   "pending_recognitions": [
     {
       "entity_id": 1,
-      "remaining_ticks": 2,
+      "remaining_ticks": 1,
       "total_delay_ticks": 6,
       "x": 16.5,
       "y": 13.5,
@@ -70,7 +71,7 @@
   "scan_events": [],
   "sound_events": [],
   "tick": 8,
-  "version": 12,
+  "version": 13,
   "visible_tiles": [
     {
       "tile_kind": "Wall",