Overhaul Feynman harness: streamline agents, prompts, and extensions

Remove legacy chains, skills, and config modules. Add citation agent,
SYSTEM.md, modular research-tools extension, and web-access layer.
Add ralph-wiggum to Pi package stack for long-running loops.

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

tests/pi-web-access.test.ts

@@ -0,0 +1,54 @@
+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 {
+	formatPiWebAccessDoctorLines,
+	getPiWebAccessStatus,
+	getPiWebSearchConfigPath,
+	loadPiWebAccessConfig,
+} from "../src/pi/web-access.js";
+
+test("loadPiWebAccessConfig returns empty config when Pi web config is missing", () => {
+	const root = mkdtempSync(join(tmpdir(), "feynman-pi-web-"));
+	const configPath = getPiWebSearchConfigPath(root);
+
+	assert.deepEqual(loadPiWebAccessConfig(configPath), {});
+});
+
+test("getPiWebAccessStatus reads Pi web-access config directly", () => {
+	const root = mkdtempSync(join(tmpdir(), "feynman-pi-web-"));
+	const configPath = getPiWebSearchConfigPath(root);
+	mkdirSync(join(root, ".pi"), { recursive: true });
+	writeFileSync(
+		configPath,
+		JSON.stringify({
+			provider: "gemini",
+			searchProvider: "gemini",
+			chromeProfile: "Profile 2",
+			geminiApiKey: "AIza...",
+		}),
+		"utf8",
+	);
+
+	const status = getPiWebAccessStatus(loadPiWebAccessConfig(configPath), configPath);
+	assert.equal(status.routeLabel, "Gemini");
+	assert.equal(status.requestProvider, "gemini");
+	assert.equal(status.geminiApiConfigured, true);
+	assert.equal(status.perplexityConfigured, false);
+	assert.equal(status.chromeProfile, "Profile 2");
+});
+
+test("formatPiWebAccessDoctorLines reports Pi-managed web access", () => {
+	const lines = formatPiWebAccessDoctorLines(
+		getPiWebAccessStatus({
+			provider: "auto",
+			searchProvider: "auto",
+		}, "/tmp/pi-web-search.json"),
+	);
+
+	assert.equal(lines[0], "web access: pi-web-access");
+	assert.ok(lines.some((line) => line.includes("/tmp/pi-web-search.json")));
+});