Tests: add global plugin contract suite

src/channels/plugins/contracts/plugin.contract.test.ts

@@ -0,0 +1,11 @@
+import { describe } from "vitest";
+import { pluginContractRegistry } from "./registry.js";
+import { installChannelPluginContractSuite } from "./suites.js";
+
+for (const entry of pluginContractRegistry) {
+  describe(`${entry.id} plugin contract`, () => {
+    installChannelPluginContractSuite({
+      plugin: entry.plugin,
+    });
+  });
+}