fix(coding-agent): preserve final TUI frame on quit

packages/coding-agent/CHANGELOG.md

@@ -24,6 +24,7 @@
 
 ### Fixed
 
+- Fixed `/quit` shutdown ordering to stop the TUI before extension UI teardown can repaint, preserving the final rendered frame while still emitting `session_shutdown` before process exit.
 - Fixed `SettingsManager.inMemory()` initial settings being lost after reloads triggered by SDK resource loading ([#3616](https://github.com/badlogic/pi-mono/issues/3616))
 - Fixed `models.json` provider compatibility to accept `compat.supportsLongCacheRetention`, allowing proxies to opt out of long-retention cache fields when needed while long retention is enabled by default when requested ([#3543](https://github.com/badlogic/pi-mono/issues/3543))
 - Fixed `--thinking xhigh` for `openai-codex` `gpt-5.5` so it is no longer downgraded to `high`.

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

@@ -3208,7 +3208,8 @@ export class InteractiveMode {
 
 	/**
 	 * Gracefully shutdown the agent.
-	 * Emits shutdown event to extensions, then exits.
+	 * Stops the TUI before emitting shutdown events so extension UI cleanup cannot
+	 * repaint the final frame while the process is exiting.
 	 */
 	private isShuttingDown = false;
 
@@ -3216,17 +3217,13 @@ export class InteractiveMode {
 		if (this.isShuttingDown) return;
 		this.isShuttingDown = true;
 		this.unregisterSignalHandlers();
-		await this.runtimeHost.dispose();
-
-		// Wait for any pending renders to complete
-		// requestRender() uses process.nextTick(), so we wait one tick
-		await new Promise((resolve) => process.nextTick(resolve));
 
 		// Drain any in-flight Kitty key release events before stopping.
 		// This prevents escape sequences from leaking to the parent shell over slow SSH.
 		await this.ui.terminal.drainInput(1000);
 
 		this.stop();
+		await this.runtimeHost.dispose();
 		process.exit(0);
 	}