Update chat lexicons (bluesky-social#4999)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: rafaeleyng

.changeset/calm-groups-limit.md

@@ -0,0 +1,5 @@
+---
+"@atproto/api": patch
+---
+
+update chat lexicons

lexicons/chat/bsky/actor/getStatus.json

@@ -9,7 +9,7 @@
         "encoding": "application/json",
         "schema": {
           "type": "object",
-          "required": ["chatDisabled", "canCreateGroups"],
+          "required": ["chatDisabled", "canCreateGroups", "groupMemberLimit"],
           "properties": {
             "chatDisabled": {
               "type": "boolean",
@@ -18,6 +18,10 @@
             "canCreateGroups": {
               "type": "boolean",
               "description": "Whether the viewer's account is allowed to create group chats. New accounts are restricted from creating groups."
+            },
+            "groupMemberLimit": {
+              "type": "integer",
+              "description": "The maximum number of members allowed in a group conversation."
             }
           }
         }

lexicons/chat/bsky/convo/defs.json

@@ -340,7 +340,13 @@
     "groupConvo": {
       "description": "[NOTE: This is under active development and should be considered unstable while this note is here].",
       "type": "object",
-      "required": ["name", "lockStatus", "memberCount", "createdAt"],
+      "required": [
+        "name",
+        "lockStatus",
+        "memberCount",
+        "memberLimit",
+        "createdAt"
+      ],
       "properties": {
         "name": {
           "type": "string",