fix(coding-agent): hide Earendil startup notice

packages/coding-agent/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Changed
+
+- Changed the Earendil announcement from an automatic startup notice to the hidden `/dementedelves` slash command.
+
 ## [0.66.0] - 2026-04-08
 
 ### New Features

packages/coding-agent/src/modes/interactive/interactive-mode.ts

@@ -437,24 +437,12 @@ export class InteractiveMode {
 		}
 	}
 
-	private shouldShowEarendilAnnouncement(): boolean {
-		const now = new Date();
-		return now.getFullYear() === 2026 && now.getMonth() === 3 && (now.getDate() === 8 || now.getDate() === 9);
-	}
-
 	private showStartupNoticesIfNeeded(): void {
 		if (this.startupNoticesShown) {
 			return;
 		}
 		this.startupNoticesShown = true;
 
-		if (this.shouldShowEarendilAnnouncement()) {
-			if (this.chatContainer.children.length > 0) {
-				this.chatContainer.addChild(new Spacer(1));
-			}
-			this.chatContainer.addChild(new EarendilAnnouncementComponent());
-		}
-
 		if (!this.changelogMarkdown) {
 			return;
 		}
@@ -2233,6 +2221,11 @@ export class InteractiveMode {
 				this.editor.setText("");
 				return;
 			}
+			if (text === "/dementedelves") {
+				this.handleDementedDelves();
+				this.editor.setText("");
+				return;
+			}
 			if (text === "/resume") {
 				this.showSessionSelector();
 				this.editor.setText("");
@@ -4608,6 +4601,12 @@ export class InteractiveMode {
 		this.ui.requestRender();
 	}
 
+	private handleDementedDelves(): void {
+		this.chatContainer.addChild(new Spacer(1));
+		this.chatContainer.addChild(new EarendilAnnouncementComponent());
+		this.ui.requestRender();
+	}
+
 	private handleDaxnuts(): void {
 		this.chatContainer.addChild(new Spacer(1));
 		this.chatContainer.addChild(new DaxnutsComponent(this.ui));