chore: upgrade ec client to have missed field

clients/event-catalog-client/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@epilot/event-catalog-client",
-  "version": "0.6.0",
+  "version": "0.6.1",
   "description": "Client for epilot Event Catalog API",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",

clients/event-catalog-client/src/openapi.d.ts

@@ -205,6 +205,10 @@ declare namespace Components {
              *
              */
             _ack_id?: string;
+            /**
+             * Inline downgrade chain stamped by Event Catalog at publish time, ordered newest-to-oldest. Present ONLY on multi-version events. Internal versioning transport: consumers (e.g. svc-webhooks) walk the payload back to a pinned version using these JSONata steps, then strip the field before delivery -- end customers never receive it.
+             */
+            _downgrades?: /* One step of an event's inline `_downgrades` chain. Maps the current-version payload to the previous version via a JSONata expression. Stamped by Event Catalog at publish time; executed by consumers during walk-back, never by EC itself. */ InlineDowngradeStep[];
         }
         /**
          * A file attachment associated with an event
@@ -890,6 +894,19 @@ declare namespace Components {
              */
             fields?: string[];
         }
+        /**
+         * One step of an event's inline `_downgrades` chain. Maps the current-version payload to the previous version via a JSONata expression. Stamped by Event Catalog at publish time; executed by consumers during walk-back, never by EC itself.
+         */
+        export interface InlineDowngradeStep {
+            /**
+             * Version label this step downgrades to (the previous version).
+             */
+            to: string;
+            /**
+             * JSONata expression mapping the current-shape payload to the previous-shape payload.
+             */
+            jsonata: string;
+        }
         /**
          * A primitive JSON Schema field definition
          */
@@ -2010,6 +2027,7 @@ export type FieldsParam = Components.Schemas.FieldsParam;
 export type GraphDefinition = Components.Schemas.GraphDefinition;
 export type GraphEdge = Components.Schemas.GraphEdge;
 export type GraphNode = Components.Schemas.GraphNode;
+export type InlineDowngradeStep = Components.Schemas.InlineDowngradeStep;
 export type PrimitiveField = Components.Schemas.PrimitiveField;
 export type SchemaField = Components.Schemas.SchemaField;
 export type SearchOptions = Components.Schemas.SearchOptions;

clients/event-catalog-client/src/openapi.json

@@ -878,6 +878,24 @@
           ]
         }
       },
+      "InlineDowngradeStep": {
+        "type": "object",
+        "description": "One step of an event's inline `_downgrades` chain. Maps the current-version payload to the previous version via a JSONata expression. Stamped by Event Catalog at publish time; executed by consumers during walk-back, never by EC itself.",
+        "properties": {
+          "to": {
+            "type": "string",
+            "description": "Version label this step downgrades to (the previous version)."
+          },
+          "jsonata": {
+            "type": "string",
+            "description": "JSONata expression mapping the current-shape payload to the previous-shape payload."
+          }
+        },
+        "required": [
+          "to",
+          "jsonata"
+        ]
+      },
       "Event": {
         "type": "object",
         "description": "An event instance in the event history",
@@ -920,6 +938,13 @@
           "_ack_id": {
             "type": "string",
             "description": "Unique acknowledgment tracking ID for the event.\nUsed to track event delivery and processing status.\n"
+          },
+          "_downgrades": {
+            "type": "array",
+            "description": "Inline downgrade chain stamped by Event Catalog at publish time, ordered newest-to-oldest. Present ONLY on multi-version events. Internal versioning transport: consumers (e.g. svc-webhooks) walk the payload back to a pinned version using these JSONata steps, then strip the field before delivery -- end customers never receive it.",
+            "items": {
+              "$ref": "#/components/schemas/InlineDowngradeStep"
+            }
           }
         },
         "required": [