feat(client): add keypair generation

plugin/core/runtime.ts

@@ -9,11 +9,12 @@ import {
 } from "../../../Yonexus.Protocol/src/index.js";
 import type { YonexusClientConfig } from "./config.js";
 import {
-  createInitialClientState,
+  ensureClientKeyPair,
   hasClientKeyPair,
   hasClientSecret,
-  type YonexusClientState,
-  type YonexusClientStateStore
+  createInitialClientState,
+  YonexusClientState,
+  YonexusClientStateStore
 } from "./state.js";
 import type { ClientConnectionState, ClientTransport } from "./transport.js";
 
@@ -66,7 +67,12 @@ export class YonexusClientRuntime {
     }
 
     this.phase = "starting";
-    this.clientState = await this.options.stateStore.load(this.options.config.identifier);
+    
+    // Load existing state and ensure key pair exists
+    let state = await this.options.stateStore.load(this.options.config.identifier);
+    const keyResult = await ensureClientKeyPair(state, this.options.stateStore);
+    this.clientState = keyResult.state;
+    
     await this.options.transport.connect();
   }