gatewayd: strip a leading mention of this bot; recognise approval commands

crates/gatewayd/src/serve/handle.rs

@@ -7,7 +7,7 @@ use std::time::{SystemTime, UNIX_EPOCH};
 use crate::deliver::{LOOP_DOWN, deliver};
 use crate::mm::{Post, typing};
 use crate::serve::{Gateway, Stop};
-use crate::sessions::{BUSY, Batch, Ignored, Pushed, Route};
+use crate::sessions::{BUSY, Batch, Ignored, M4B_COMMAND, Pushed, Route};
 use crate::state::InFlight;
 use crate::ws::WsError;
 use crate::ws::conn::Ws;
@@ -81,6 +81,8 @@ impl Gateway {
             }
             Route::Ignore(_) => {}
             Route::Reply { thread, text } => self.post(&thread.channel, &thread.root, &text),
+            // Until the approvals module is wired in (task 15), M4a's notice.
+            Route::Approval { thread, .. } => self.post(&thread.channel, &thread.root, M4B_COMMAND),
             Route::Queue(message) => {
                 if message.joins_thread {
                     self.state.join_thread(&message.thread.root)?;