feat(registry): Add hot-reload websocket, embedded UI bundling, and multi-platform Deno build tasks

Introduce a ReloadSocketManager and client ReloadService for automatic page reloads when the server restarts. Serve UI assets from an embedded generated file and add Deno tasks to bundle the UI and compile native binaries for multiple platforms. Also update dev watch workflow and ignore generated embedded UI file.

ts/reload-socket.ts

@@ -0,0 +1,65 @@
+/**
+ * WebSocket manager for hot reload
+ * Generates a unique instance ID on startup and broadcasts it to connected clients.
+ * When the server restarts, clients detect the new ID and reload the page.
+ */
+export class ReloadSocketManager {
+  private instanceId: string;
+  private clients: Set<WebSocket> = new Set();
+
+  constructor() {
+    this.instanceId = crypto.randomUUID();
+    console.log(`[ReloadSocket] Instance ID: ${this.instanceId}`);
+  }
+
+  /**
+   * Get the current instance ID
+   */
+  getInstanceId(): string {
+    return this.instanceId;
+  }
+
+  /**
+   * Handle WebSocket upgrade request
+   */
+  handleUpgrade(request: Request): Response {
+    const { socket, response } = Deno.upgradeWebSocket(request);
+
+    socket.onopen = () => {
+      this.clients.add(socket);
+      console.log(`[ReloadSocket] Client connected (${this.clients.size} total)`);
+      // Send instance ID immediately
+      socket.send(JSON.stringify({ type: 'instance', id: this.instanceId }));
+    };
+
+    socket.onclose = () => {
+      this.clients.delete(socket);
+      console.log(`[ReloadSocket] Client disconnected (${this.clients.size} remaining)`);
+    };
+
+    socket.onerror = (error) => {
+      console.error('[ReloadSocket] WebSocket error:', error);
+    };
+
+    return response;
+  }
+
+  /**
+   * Broadcast a message to all connected clients
+   */
+  broadcast(message: object): void {
+    const msg = JSON.stringify(message);
+    for (const client of this.clients) {
+      if (client.readyState === WebSocket.OPEN) {
+        client.send(msg);
+      }
+    }
+  }
+
+  /**
+   * Get the number of connected clients
+   */
+  getClientCount(): number {
+    return this.clients.size;
+  }
+}