feat(coding-agent): add startup.quiet setting to silence startup output (#777)

* feat(coding-agent): add startup.quiet setting to silence startup output

* feat(coding-agent): add startup.quiet setting to silence startup output

Adds a new setting `startup.quiet` that when set to `true` hides:
- Version and keybinding hints header
- Loaded context/skills/templates/extensions discovery info
- Model scope line

Changelog notifications are still shown so users know about updates.

Usage in ~/.pi/agent/settings.json:
{
  "startup": {
    "quiet": true
  }
}

* refactor: flatten startup.quiet to quietStartup on Settings

packages/coding-agent/src/core/settings-manager.ts

@@ -60,6 +60,7 @@ export interface Settings {
 	retry?: RetrySettings;
 	hideThinkingBlock?: boolean;
 	shellPath?: string; // Custom shell path (e.g., for Cygwin users on Windows)
+	quietStartup?: boolean;
 	collapseChangelog?: boolean; // Show condensed changelog after update (use /changelog for full)
 	extensions?: string[]; // Array of extension file paths
 	skills?: SkillsSettings;
@@ -346,6 +347,15 @@ export class SettingsManager {
 		this.save();
 	}
 
+	getQuietStartup(): boolean {
+		return this.settings.quietStartup ?? false;
+	}
+
+	setQuietStartup(quiet: boolean): void {
+		this.globalSettings.quietStartup = quiet;
+		this.save();
+	}
+
 	getCollapseChangelog(): boolean {
 		return this.settings.collapseChangelog ?? false;
 	}

packages/coding-agent/src/main.ts

@@ -503,7 +503,7 @@ export async function main(args: string[]) {
 	if (mode === "rpc") {
 		await runRpcMode(session);
 	} else if (isInteractive) {
-		if (scopedModels.length > 0) {
+		if (scopedModels.length > 0 && !settingsManager.getQuietStartup()) {
 			const modelList = scopedModels
 				.map((sm) => {
 					const thinkingStr = sm.thinkingLevel ? `:${sm.thinkingLevel}` : "";

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

@@ -357,7 +357,8 @@ export class InteractiveMode {
 		this.fdPath = await ensureTool("fd");
 		this.setupAutocomplete(this.fdPath);
 
-		// Add header with keybindings from config
+		// Add header with keybindings from config (unless silenced)
+		if (!this.settingsManager.getQuietStartup()) {
 			const logo = theme.bold(theme.fg("accent", APP_NAME)) + theme.fg("dim", ` v${this.version}`);
 
 			// Build startup instructions using keybinding hint helpers
@@ -408,6 +409,18 @@ export class InteractiveMode {
 				}
 				this.ui.addChild(new DynamicBorder());
 			}
+		} else {
+			// Minimal header when silenced
+			this.builtInHeader = new Text("", 0, 0);
+			if (this.changelogMarkdown) {
+				// Still show changelog notification even in silent mode
+				this.ui.addChild(new Spacer(1));
+				const versionMatch = this.changelogMarkdown.match(/##\s+\[?(\d+\.\d+\.\d+)\]?/);
+				const latestVersion = versionMatch ? versionMatch[1] : this.version;
+				const condensedText = `Updated to v${latestVersion}. Use ${theme.bold("/changelog")} to view full changelog.`;
+				this.ui.addChild(new Text(condensedText, 1, 0));
+			}
+		}
 
 		this.ui.addChild(this.chatContainer);
 		this.ui.addChild(this.pendingMessagesContainer);
@@ -573,6 +586,8 @@ export class InteractiveMode {
 	 * Initialize the extension system with TUI-based UI context.
 	 */
 	private async initExtensions(): Promise<void> {
+		// Show discovery info unless silenced
+		if (!this.settingsManager.getQuietStartup()) {
 			// Show loaded project context files
 			const contextFiles = loadProjectContextFiles();
 			if (contextFiles.length > 0) {
@@ -592,7 +607,9 @@ export class InteractiveMode {
 			// Show skill warnings if any
 			const skillWarnings = this.session.skillWarnings;
 			if (skillWarnings.length > 0) {
-			const warningList = skillWarnings.map((w) => theme.fg("warning", `  ${w.skillPath}: ${w.message}`)).join("\n");
+				const warningList = skillWarnings
+					.map((w) => theme.fg("warning", `  ${w.skillPath}: ${w.message}`))
+					.join("\n");
 				this.chatContainer.addChild(new Text(theme.fg("warning", "Skill warnings:\n") + warningList, 0, 0));
 				this.chatContainer.addChild(new Spacer(1));
 			}
@@ -604,6 +621,7 @@ export class InteractiveMode {
 				this.chatContainer.addChild(new Text(theme.fg("muted", "Loaded prompt templates:\n") + templateList, 0, 0));
 				this.chatContainer.addChild(new Spacer(1));
 			}
+		}
 
 		const extensionRunner = this.session.extensionRunner;
 		if (!extensionRunner) {
@@ -748,13 +766,15 @@ export class InteractiveMode {
 		// Set up extension-registered shortcuts
 		this.setupExtensionShortcuts(extensionRunner);
 
-		// Show loaded extensions
+		// Show loaded extensions (unless silenced)
+		if (!this.settingsManager.getQuietStartup()) {
 			const extensionPaths = extensionRunner.getExtensionPaths();
 			if (extensionPaths.length > 0) {
 				const extList = extensionPaths.map((p) => theme.fg("dim", `  ${p}`)).join("\n");
 				this.chatContainer.addChild(new Text(theme.fg("muted", "Loaded extensions:\n") + extList, 0, 0));
 				this.chatContainer.addChild(new Spacer(1));
 			}
+		}
 
 		// Emit session_start event
 		await extensionRunner.emit({