Polish Feynman harness and stabilize Pi web runtime

tests/feynman-config.test.ts

@@ -0,0 +1,60 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { mkdtempSync, mkdirSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+
+import {
+	configureWebSearchProvider,
+	getConfiguredWebSearchProvider,
+	loadFeynmanConfig,
+	saveFeynmanConfig,
+} from "../src/config/feynman-config.js";
+
+test("loadFeynmanConfig falls back to legacy web-search config", () => {
+	const root = mkdtempSync(join(tmpdir(), "feynman-config-"));
+	const configPath = join(root, "config.json");
+	const legacyDir = join(process.env.HOME ?? root, ".pi");
+	const legacyPath = join(legacyDir, "web-search.json");
+	mkdirSync(legacyDir, { recursive: true });
+	writeFileSync(
+		legacyPath,
+		JSON.stringify({
+			feynmanWebProvider: "perplexity",
+			perplexityApiKey: "legacy-key",
+		}),
+		"utf8",
+	);
+
+	const config = loadFeynmanConfig(configPath);
+	assert.equal(config.version, 1);
+	assert.equal(config.webSearch?.feynmanWebProvider, "perplexity");
+	assert.equal(config.webSearch?.perplexityApiKey, "legacy-key");
+});
+
+test("saveFeynmanConfig persists sessionDir and webSearch", () => {
+	const root = mkdtempSync(join(tmpdir(), "feynman-config-"));
+	const configPath = join(root, "config.json");
+	const webSearch = configureWebSearchProvider({}, "gemini-browser", { chromeProfile: "Profile 2" });
+
+	saveFeynmanConfig(
+		{
+			version: 1,
+			sessionDir: "/tmp/feynman-sessions",
+			webSearch,
+		},
+		configPath,
+	);
+
+	const config = loadFeynmanConfig(configPath);
+	assert.equal(config.sessionDir, "/tmp/feynman-sessions");
+	assert.equal(config.webSearch?.feynmanWebProvider, "gemini-browser");
+	assert.equal(config.webSearch?.chromeProfile, "Profile 2");
+});
+
+test("default web provider falls back to Pi web via gemini-browser", () => {
+	const provider = getConfiguredWebSearchProvider({});
+
+	assert.equal(provider.id, "gemini-browser");
+	assert.equal(provider.runtimeProvider, "gemini");
+});