Implement heartbeat send and re-pair trust reset

plugin/core/runtime.ts

@@ -1,6 +1,7 @@
 import {
   YONEXUS_PROTOCOL_VERSION,
   buildAuthRequest,
+  buildHeartbeat,
   buildHello,
   buildPairConfirm,
   createAuthRequestSigningInput,
@@ -109,6 +110,7 @@ export class YonexusClientRuntime {
 
   async handleMessage(raw: string): Promise<void> {
     if (raw === "heartbeat_tick") {
+      await this.handleHeartbeatTick();
       return;
     }
 
@@ -150,14 +152,12 @@ export class YonexusClientRuntime {
     }
 
     if (envelope.type === "auth_failed") {
-      this.handleAuthFailed(envelope as TypedBuiltinEnvelope<"auth_failed">);
+      await this.handleAuthFailed(envelope as TypedBuiltinEnvelope<"auth_failed">);
       return;
     }
 
     if (envelope.type === "re_pair_required") {
-      this.pendingPairing = undefined;
-      this.lastPairingFailure = "re_pair_required";
-      this.phase = "pair_required";
+      await this.handleRePairRequired();
       return;
     }
   }
@@ -283,14 +283,22 @@ export class YonexusClientRuntime {
     this.phase = "waiting_pair_confirm";
   }
 
-  private handleAuthFailed(envelope: TypedBuiltinEnvelope<"auth_failed">): void {
+  private async handleAuthFailed(
+    envelope: TypedBuiltinEnvelope<"auth_failed">
+  ): Promise<void> {
     const payload = envelope.payload as AuthFailedPayload | undefined;
     if (!payload) {
       return;
     }
 
+    if (payload.reason === "re_pair_required") {
       this.lastPairingFailure = payload.reason;
-    this.phase = payload.reason === "re_pair_required" ? "pair_required" : "auth_required";
+      await this.resetTrustState();
+      return;
+    }
+
+    this.lastPairingFailure = payload.reason;
+    this.phase = "auth_required";
   }
 
   private async sendAuthRequest(): Promise<void> {
@@ -330,6 +338,43 @@ export class YonexusClientRuntime {
       )
     );
   }
+
+  private async handleHeartbeatTick(): Promise<void> {
+    if (this.phase !== "authenticated" || !this.options.transport.isConnected) {
+      return;
+    }
+
+    this.options.transport.send(
+      encodeBuiltin(
+        buildHeartbeat(
+          {
+            identifier: this.options.config.identifier,
+            status: "alive"
+          },
+          { timestamp: this.now() }
+        )
+      )
+    );
+  }
+
+  private async handleRePairRequired(): Promise<void> {
+    this.pendingPairing = undefined;
+    this.lastPairingFailure = "re_pair_required";
+    await this.resetTrustState();
+  }
+
+  private async resetTrustState(): Promise<void> {
+    this.clientState = {
+      ...this.clientState,
+      secret: undefined,
+      pairedAt: undefined,
+      authenticatedAt: undefined,
+      updatedAt: this.now()
+    };
+
+    await this.options.stateStore.save(this.clientState);
+    this.phase = "pair_required";
+  }
 }
 
 export function createYonexusClientRuntime(