Slack: add some fixes and connect it all up

src/cli/deps.ts

@@ -2,12 +2,14 @@ import { sendMessageDiscord } from "../discord/send.js";
 import { sendMessageIMessage } from "../imessage/send.js";
 import { logWebSelfId, sendMessageWhatsApp } from "../providers/web/index.js";
 import { sendMessageSignal } from "../signal/send.js";
+import { sendMessageSlack } from "../slack/send.js";
 import { sendMessageTelegram } from "../telegram/send.js";
 
 export type CliDeps = {
   sendMessageWhatsApp: typeof sendMessageWhatsApp;
   sendMessageTelegram: typeof sendMessageTelegram;
   sendMessageDiscord: typeof sendMessageDiscord;
+  sendMessageSlack: typeof sendMessageSlack;
   sendMessageSignal: typeof sendMessageSignal;
   sendMessageIMessage: typeof sendMessageIMessage;
 };
@@ -17,6 +19,7 @@ export function createDefaultDeps(): CliDeps {
     sendMessageWhatsApp,
     sendMessageTelegram,
     sendMessageDiscord,
+    sendMessageSlack,
     sendMessageSignal,
     sendMessageIMessage,
   };