Initial import: open-design source for helix-mind.ai distribution

This repository contains the open-design daemon CLI source code, built
and packaged at https://helix-mind.ai/cli/open-design/latest.tgz for use
by the HelixMind /design slash command.

Licenses: Apache-2.0 (root) + MIT (skills/*)

scripts/postinstall.mjs

@@ -0,0 +1,50 @@
+import { spawnSync } from "node:child_process";
+import { dirname, extname, resolve } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const scriptDir = dirname(fileURLToPath(import.meta.url));
+const repoRoot = resolve(scriptDir, "..");
+
+const buildTargets = [
+  "packages/contracts",
+  "packages/sidecar-proto",
+  "packages/sidecar",
+  "packages/platform",
+  "tools/dev",
+  "tools/pack",
+];
+
+const jsExtensions = new Set([".js", ".cjs", ".mjs"]);
+
+function resolvePackageManagerInvocation() {
+  const pnpmExecPath = process.env.npm_execpath;
+  if (pnpmExecPath != null && pnpmExecPath.length > 0) {
+    if (jsExtensions.has(extname(pnpmExecPath).toLowerCase())) {
+      return { argsPrefix: [pnpmExecPath], command: process.execPath };
+    }
+    return { argsPrefix: [], command: pnpmExecPath };
+  }
+
+  return { argsPrefix: [], command: process.platform === "win32" ? "pnpm.cmd" : "pnpm" };
+}
+
+const packageManager = resolvePackageManagerInvocation();
+
+for (const target of buildTargets) {
+  const result = spawnSync(
+    packageManager.command,
+    [...packageManager.argsPrefix, "-C", target, "run", "build"],
+    {
+      cwd: repoRoot,
+      stdio: "inherit",
+    },
+  );
+
+  if (result.error != null) {
+    throw result.error;
+  }
+
+  if (result.status !== 0) {
+    process.exit(result.status ?? 1);
+  }
+}