Remove allowDuringStreaming flag - commands always run immediately

Hook commands now always execute immediately, even during streaming.
If a command needs to interact with the LLM, it uses pi.sendMessage()
which handles queueing automatically.

This simplifies the API and eliminates the issue of queued slash
commands being sent to the LLM instead of executing.

.pi/hooks/test-command.ts

@@ -29,14 +29,6 @@ export default function (pi: HookAPI) {
 		return box;
 	});
 
-	pi.registerCommand("no-stream", {
-		description: "Send a message without streaming",
-		handler: async (ctx) => {
-			ctx.ui.notify("Sending message after streaming is done...");
-		},
-		allowDuringStreaming: true,
-	})
-
 	// Register /test-msg command
 	pi.registerCommand("test-msg", {
 		description: "Send a test custom message",