Remove flask ASCII art and update harness internals

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/pi-settings.test.ts

@@ -0,0 +1,18 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+
+import { normalizeThinkingLevel } from "../src/pi/settings.js";
+
+test("normalizeThinkingLevel accepts the latest Pi thinking levels", () => {
+	assert.equal(normalizeThinkingLevel("off"), "off");
+	assert.equal(normalizeThinkingLevel("minimal"), "minimal");
+	assert.equal(normalizeThinkingLevel("low"), "low");
+	assert.equal(normalizeThinkingLevel("medium"), "medium");
+	assert.equal(normalizeThinkingLevel("high"), "high");
+	assert.equal(normalizeThinkingLevel("xhigh"), "xhigh");
+});
+
+test("normalizeThinkingLevel rejects unknown values", () => {
+	assert.equal(normalizeThinkingLevel("turbo"), undefined);
+	assert.equal(normalizeThinkingLevel(undefined), undefined);
+});