Fix InlineWebSocketAdapter message delivery

[robbertvanginkel]

When attempting to reproduce https://www.rivet.dev/docs/actors/websocket-handler/ with createFileSystemDriver, messages sent from the actor to the client are never delivered. The connection appears to work (open/close events fire), but message routing fails silently. When using handleRawWebSocket with an InlineWebSocketAdapter, messages sent from the actor to the client are never delivered.

rivet/rivetkit-typescript/packages/rivetkit/src/actor/router-websocket-endpoints.ts

Lines 319 to 325 in c9cfd90

	onMessage: (event: any, ws: any) => {
	// Find the adapter for this WebSocket
	const adapter = (ws as any).__adapter;
	if (adapter) {
	adapter._handleMessage(event);
	}
	},

Looks up an adaptor, but this is never set for InlineWebSocketAdapter.

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