feat: add /config chat config updates

src/config/config-paths.test.ts

@@ -0,0 +1,28 @@
+import { describe, expect, it } from "vitest";
+
+import {
+  getConfigValueAtPath,
+  parseConfigPath,
+  setConfigValueAtPath,
+  unsetConfigValueAtPath,
+} from "./config-paths.js";
+
+describe("config paths", () => {
+  it("rejects empty and blocked paths", () => {
+    expect(parseConfigPath("")).toEqual({
+      ok: false,
+      error: "Invalid path. Use dot notation (e.g. foo.bar).",
+    });
+    expect(parseConfigPath("__proto__.polluted").ok).toBe(false);
+  });
+
+  it("sets, gets, and unsets nested values", () => {
+    const root: Record<string, unknown> = {};
+    const parsed = parseConfigPath("foo.bar");
+    if (!parsed.ok || !parsed.path) throw new Error("path parse failed");
+    setConfigValueAtPath(root, parsed.path, 123);
+    expect(getConfigValueAtPath(root, parsed.path)).toBe(123);
+    expect(unsetConfigValueAtPath(root, parsed.path)).toBe(true);
+    expect(getConfigValueAtPath(root, parsed.path)).toBeUndefined();
+  });
+});