refactor(coding-agent): simplified temporary model status message

- Inlined the temporary model status formatting logic directly into the controller.
- Removed the unused `formatTemporaryModelStatus` utility function and its associated test.

packages/coding-agent/src/modes/controllers/selector-controller.ts

@@ -71,10 +71,6 @@ import { buildCopyTargets } from "../utils/copy-targets";
 
 const MANUAL_LOGIN_TIP = "Tip: You can complete pairing with /login <redirect URL>.";
 
-export function formatTemporaryModelStatus(modelLabel: string, roleSelectorHint = "Alt+M"): string {
-	return `Temporary model selection is session-only: ${modelLabel}. Use ${roleSelectorHint} or /model for role models (default/smol/plan/task/slow/custom roles).`;
-}
-
 export class SelectorController {
 	constructor(private ctx: InteractiveModeContext) {}
 
@@ -499,7 +495,9 @@ export class SelectorController {
 							this.ctx.statusLine.invalidate();
 							this.ctx.updateEditorBorderColor();
 							const roleSelectorHint = this.ctx.keybindings.getKeys("app.model.select")[0] ?? "Alt+M";
-							this.ctx.showStatus(formatTemporaryModelStatus(selector ?? model.id, roleSelectorHint));
+							this.ctx.showStatus(
+								`Session-only model: ${selector ?? model.id}. Use ${roleSelectorHint} or /model for roles.`,
+							);
 							done();
 							this.ctx.ui.requestRender();
 						} else if (role === "default") {

packages/coding-agent/src/prompts/system/system-prompt.md

@@ -17,7 +17,6 @@ You are a helpful assistant the team trusts with load-bearing changes, operating
 - You are not alone in this repo. Treat unexpected changes as the user's work and adapt.
 - In terminal prose and final chat, you MAY use LaTeX math (`$`, `$$`, `\text`, `\times`) and color (`\textcolor`, `\colorbox`, `\fcolorbox`).
 - To show a diagram, you MAY emit a ` ```mermaid ` block — the terminal renders it as ASCII. Use it for genuine structure or flow, not trivia.
-- For a visual separator between sections, use `─` (U+2500).
 
 RUNTIME
 ==============

packages/coding-agent/test/selector-settings-side-effects.test.ts

@@ -1,9 +1,6 @@
 import { afterEach, beforeEach, describe, expect, it, vi } from "bun:test";
 import { Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
-import {
-	formatTemporaryModelStatus,
-	SelectorController,
-} from "@oh-my-pi/pi-coding-agent/modes/controllers/selector-controller";
+import { SelectorController } from "@oh-my-pi/pi-coding-agent/modes/controllers/selector-controller";
 import { beginSettingsTest, restoreSettingsTestState, type SettingsTestState } from "./helpers/settings-test-state";
 
 let settingsState: SettingsTestState | undefined;
@@ -19,12 +16,6 @@ afterEach(() => {
 });
 
 describe("selector setting side effects", () => {
-	it("formats temporary model status with role assignment guidance", () => {
-		expect(formatTemporaryModelStatus("openai/gpt-5.1", "alt+m")).toBe(
-			"Temporary model selection is session-only: openai/gpt-5.1. Use alt+m or /model for role models (default/smol/plan/task/slow/custom roles).",
-		);
-	});
-
 	it("refreshes the status line when git integration changes at runtime", () => {
 		const updateSettings = vi.fn();
 		const updateEditorTopBorder = vi.fn();