feat(coding-agent): add configurable assistant output padding

Closes #6168

packages/coding-agent/test/settings-manager.test.ts

@@ -397,6 +397,29 @@ describe("SettingsManager", () => {
 		});
 	});
 
+	describe("outputPad", () => {
+		it("should default to 1 and persist binary values", async () => {
+			const manager = SettingsManager.create(projectDir, agentDir);
+
+			expect(manager.getOutputPad()).toBe(1);
+
+			manager.setOutputPad(0);
+			await manager.flush();
+
+			expect(manager.getOutputPad()).toBe(0);
+			const savedSettings = JSON.parse(readFileSync(join(agentDir, "settings.json"), "utf-8"));
+			expect(savedSettings.outputPad).toBe(0);
+		});
+
+		it("should treat unsupported outputPad values as default padding", () => {
+			writeFileSync(join(agentDir, "settings.json"), JSON.stringify({ outputPad: 2 }));
+
+			const manager = SettingsManager.create(projectDir, agentDir);
+
+			expect(manager.getOutputPad()).toBe(1);
+		});
+	});
+
 	describe("shellCommandPrefix", () => {
 		it("should load shellCommandPrefix from settings", () => {
 			const settingsPath = join(agentDir, "settings.json");