feat(core): jobs, scheduler, plugin registry, connections

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

packages/core/test/registry.test.ts

@@ -0,0 +1,24 @@
+import { expect, spyOn, test } from "bun:test";
+import { join } from "node:path";
+import { loadPlugins } from "../src/registry.ts";
+
+const dir = join(import.meta.dir, "fixtures/plugins");
+
+test("registry loads echo plugin and skips broken one", async () => {
+  const warn = spyOn(console, "warn").mockImplementation(() => {});
+  const reg = await loadPlugins([dir, join(dir, "does-not-exist")]);
+  expect(reg.list().map((m) => m.id)).toEqual(["echo"]);
+  expect(reg.get("echo")?.manifest.name).toBe("Echo");
+  expect(reg.get("broken")).toBeUndefined();
+  expect(warn.mock.calls.some((c) => String(c[0]).includes("broken"))).toBe(true);
+  await reg.reload();
+  expect(reg.list()).toHaveLength(1);
+  warn.mockRestore();
+});
+
+test("duplicate ids across dirs keep the first", async () => {
+  const warn = spyOn(console, "warn").mockImplementation(() => {});
+  const reg = await loadPlugins([dir, dir]);
+  expect(reg.list()).toHaveLength(1);
+  warn.mockRestore();
+});