fix: add marketplace plugin icon

Adds a Codex marketplace composer icon, wires the plugin manifest, and validates icon/version integrity.

Author: ndycode

.codex-plugin/plugin.json

@@ -1,6 +1,9 @@
 {
   "name": "codex-multi-auth",
-  "version": "1.2.2",
+  "version": "2.1.10",
   "description": "Install and operate codex-multi-auth for the official @openai/codex CLI with multi-account OAuth rotation, switching, health checks, and recovery tools.",
+  "interface": {
+    "composerIcon": "./assets/codex-multi-auth-icon.svg"
+  },
   "skills": "./skills/"
 }

assets/codex-multi-auth-icon.svg

@@ -0,0 +1,41 @@
+import { existsSync, readFileSync } from "node:fs";
+import path from "node:path";
+import { describe, expect, it } from "vitest";
+
+type PluginManifest = {
+	version?: string;
+	interface?: {
+		composerIcon?: string;
+	};
+};
+
+type PackageManifest = {
+	version?: string;
+};
+
+const pluginManifestPath = path.join(".codex-plugin", "plugin.json");
+
+const readJson = <T>(filePath: string): T => JSON.parse(readFileSync(filePath, "utf8")) as T;
+
+const resolveRepoRootRelativePath = (relativePath: string): string =>
+	path.resolve(relativePath.replace(/^\.\//, ""));
+
+describe("Codex plugin manifest", () => {
+	it("declares an existing marketplace composer icon and matches the package version", () => {
+		const manifest = readJson<PluginManifest>(pluginManifestPath);
+		const pkg = readJson<PackageManifest>("package.json");
+
+		expect(manifest.interface?.composerIcon).toBe("./assets/codex-multi-auth-icon.svg");
+		expect(manifest.version).toBe(pkg.version);
+
+		const iconPath = manifest.interface?.composerIcon;
+		expect(iconPath).toBeDefined();
+		expect(existsSync(resolveRepoRootRelativePath(iconPath ?? ""))).toBe(true);
+	});
+
+	it("normalizes dot-slash icon paths before resolving them from the repository root", () => {
+		expect(resolveRepoRootRelativePath("./assets/codex-multi-auth-icon.svg")).toBe(
+			path.resolve("assets", "codex-multi-auth-icon.svg"),
+		);
+	});
+});