fix: sync Kalshi spec with upstream API changes

core/specs/kalshi/Kalshi.yaml

@@ -863,6 +863,13 @@ paths:
         - kalshiAccessKey: []
           kalshiAccessSignature: []
           kalshiAccessTimestamp: []
+      parameters:
+        - name: subaccount
+          in: query
+          required: false
+          schema:
+            type: integer
+          description: Subaccount number (0 for primary, 1-32 for subaccounts). When provided, returns only that subaccount's balance.
       responses:
         '200':
           description: Balance retrieved successfully
@@ -4088,6 +4095,10 @@ components:
           type: integer
           format: int64
           description: Unix timestamp of the last update to the balance.
+        balance_dollars:
+          type: number
+          format: double
+          description: Member's available balance in USD dollars.
 
     CreateSubaccountResponse:
       type: object
@@ -4417,6 +4428,10 @@ components:
           nullable: true
           x-omitempty: true
           description: Subaccount number (0 for primary, 1-32 for subaccounts). Present for direct users.
+        ts_ms:
+          type: integer
+          format: int64
+          description: Order timestamp in milliseconds (Unix epoch).
 
     Milestone:
       type: object
@@ -4852,9 +4867,6 @@ components:
         order_id:
           type: string
           description: Unique identifier for the order that resulted in this fill
-        client_order_id:
-          type: string
-          description: Client-provided identifier for the order that resulted in this fill
         ticker:
           type: string
           description: Unique identifier for the market

core/src/exchanges/kalshi/api.ts

@@ -1,6 +1,6 @@
 /**
- * Auto-generated from /home/zihao/pmxt/core/specs/kalshi/Kalshi.yaml
- * Generated at: 2026-05-10T23:00:51.402Z
+ * Auto-generated from /Users/samueltinnerholm/Documents/GitHub/pmxt/.claude/worktrees/agent-a6e1b73d/core/specs/kalshi/Kalshi.yaml
+ * Generated at: 2026-05-24T14:48:08.117Z
  * Do not edit manually -- run "npm run fetch:openapi" to regenerate.
  */
 export const kalshiApiSpec = {
@@ -644,6 +644,16 @@ export const kalshiApiSpec = {
                         "kalshiAccessSignature": [],
                         "kalshiAccessTimestamp": []
                     }
+                ],
+                "parameters": [
+                    {
+                        "name": "subaccount",
+                        "in": "query",
+                        "required": false,
+                        "schema": {
+                            "type": "integer"
+                        }
+                    }
                 ]
             }
         },