fix: bundled plugins path for source runs and backend cleanup

src/backend/tests/plugins/paths.test.ts

@@ -0,0 +1,24 @@
+import path from "node:path";
+import { afterEach, describe, expect, it } from "vitest";
+import { getBundledPluginsDir } from "../../plugins/paths.js";
+
+describe("getBundledPluginsDir", () => {
+  const saved = process.env.TERMIX_BUNDLED_PLUGINS_DIR;
+
+  afterEach(() => {
+    if (saved === undefined) delete process.env.TERMIX_BUNDLED_PLUGINS_DIR;
+    else process.env.TERMIX_BUNDLED_PLUGINS_DIR = saved;
+  });
+
+  it("reads dist/plugins when run from source", () => {
+    delete process.env.TERMIX_BUNDLED_PLUGINS_DIR;
+    expect(getBundledPluginsDir()).toBe(
+      path.resolve(process.cwd(), "dist", "plugins"),
+    );
+  });
+
+  it("honors the override", () => {
+    process.env.TERMIX_BUNDLED_PLUGINS_DIR = "/somewhere/else";
+    expect(getBundledPluginsDir()).toBe("/somewhere/else");
+  });
+});