Rename bot references from ocw to OpenWorker

Correlation token now emits [ow:id]; legacy [ocw:id] replies still parse.
Invite hints and docstrings say @OpenWorker.

surfaces/gui/src/api.ts

@@ -1472,7 +1472,7 @@ export interface SlackMember {
 }
 
 // One channel from the workspace roster. Private channels appear only where the
-// bot is a member (Slack API constraint); is_member=false → "invite @ocw" hint.
+// bot is a member (Slack API constraint); is_member=false → "invite @OpenWorker" hint.
 export interface SlackChannelEntry {
   id: string;
   name: string;

surfaces/gui/src/components/AutomationQuickstart.tsx

@@ -495,7 +495,7 @@ export function AutomationQuickstart({
                     />
                   </div>
                   <p className="text-[11px] text-warnInk mt-1">
-                    The bot must be a member of the channel — invite @ocw in Slack if it isn't.
+                    The bot must be a member of the channel — invite @OpenWorker in Slack if it isn't.
                   </p>
                 </>
               )}