Refactor CLI and Twilio modules; add helper tests and comments

src/auto-reply/claude.test.ts

@@ -0,0 +1,20 @@
+import { describe, expect, it } from "vitest";
+
+import { parseClaudeJsonText } from "./claude.js";
+
+describe("claude JSON parsing", () => {
+	it("extracts text from single JSON object", () => {
+		const out = parseClaudeJsonText('{"text":"hello"}');
+		expect(out).toBe("hello");
+	});
+
+	it("extracts from newline-delimited JSON", () => {
+		const out = parseClaudeJsonText('{"irrelevant":1}\n{"text":"there"}');
+		expect(out).toBe("there");
+	});
+
+	it("returns undefined on invalid JSON", () => {
+		expect(parseClaudeJsonText("not json")).toBeUndefined();
+	});
+});
+