feat: make each plugin an npm workspace built by a termix-plugin CLI

packages/plugin-sdk/cli/commands/test.mjs

@@ -0,0 +1,33 @@
+import { spawnSync } from "node:child_process";
+import path from "node:path";
+import { createRequire } from "node:module";
+
+/**
+ * Runs vitest through its own entry rather than the npx shim, so no shell is
+ * involved and paths with spaces work the same on every platform.
+ */
+export async function test({ cwd, args }) {
+  const require = createRequire(import.meta.url);
+
+  let vitestBin;
+  try {
+    // vitest.mjs is the package bin, not an exported subpath, so resolve the
+    // manifest and walk to it.
+    const manifest = require.resolve("vitest/package.json", { paths: [cwd] });
+    vitestBin = path.join(path.dirname(manifest), "vitest.mjs");
+  } catch {
+    throw new Error(
+      "vitest is not installed. Run npm install at the repo root.",
+    );
+  }
+
+  const result = spawnSync(
+    process.execPath,
+    [vitestBin, "run", "--config", "vitest.config.ts", ...args],
+    { cwd, stdio: "inherit" },
+  );
+
+  if (result.status !== 0) {
+    throw new Error(`vitest exited with ${result.status}`);
+  }
+}