feat(dev): auto-switch ports on dev:all when defaults are busy

Adds a small launcher (scripts/dev-all.mjs) that probes free ports
for the daemon (OD_PORT, default 7456) and Vite (VITE_PORT, default
5173) before invoking concurrently, so a stray process holding
either port no longer breaks the boot. The resolved ports are
exported into the child env; vite.config.ts now reads VITE_PORT to
keep its dev server and /api proxy aligned with the daemon's actual
port.

Made-with: Cursor

package.json

@@ -11,7 +11,7 @@
   "scripts": {
     "daemon": "node daemon/cli.js --no-open",
     "dev": "vite",
-    "dev:all": "concurrently -k -n daemon,web -c cyan,magenta \"npm:daemon\" \"npm:dev\"",
+    "dev:all": "node scripts/dev-all.mjs",
     "build": "tsc -b && vite build",
     "preview": "vite preview",
     "typecheck": "tsc -b --noEmit",

scripts/dev-all.mjs

@@ -0,0 +1,84 @@
+#!/usr/bin/env node
+// Launcher for `npm run dev:all`.
+//
+// Probes for free ports for the daemon (OD_PORT, default 7456) and the Vite
+// dev server (VITE_PORT, default 5173) before spawning `concurrently`, so a
+// stray process holding either port doesn't kill the whole boot. The
+// resolved ports are exported into the child env, which means:
+//   * the daemon's cli.js sees the new OD_PORT and binds to it
+//   * vite.config.ts reads the same OD_PORT and points its /api proxy at
+//     the daemon's actual port
+//   * Vite itself binds to VITE_PORT
+//
+// If a port is busy we walk forward up to PORT_SEARCH_RANGE steps and log
+// the switch so the user notices.
+
+import { spawn } from 'node:child_process';
+import net from 'node:net';
+
+const HOST = '127.0.0.1';
+const PORT_SEARCH_RANGE = 50;
+
+function isPortFree(port, host = HOST) {
+  return new Promise((resolve) => {
+    const server = net.createServer();
+    server.unref();
+    server.once('error', () => resolve(false));
+    server.listen({ port, host, exclusive: true }, () => {
+      server.close(() => resolve(true));
+    });
+  });
+}
+
+async function findFreePort(start, label) {
+  for (let port = start; port < start + PORT_SEARCH_RANGE; port++) {
+    if (await isPortFree(port)) return port;
+  }
+  throw new Error(
+    `[dev:all] could not find a free ${label} port near ${start} (tried ${PORT_SEARCH_RANGE})`,
+  );
+}
+
+const desiredDaemon = Number(process.env.OD_PORT) || 7456;
+const desiredVite = Number(process.env.VITE_PORT) || 5173;
+
+const daemonPort = await findFreePort(desiredDaemon, 'daemon');
+const vitePort = await findFreePort(desiredVite, 'vite');
+
+if (daemonPort !== desiredDaemon) {
+  console.log(
+    `[dev:all] daemon port ${desiredDaemon} is busy, switching to ${daemonPort}`,
+  );
+}
+if (vitePort !== desiredVite) {
+  console.log(
+    `[dev:all] vite port ${desiredVite} is busy, switching to ${vitePort}`,
+  );
+}
+
+const env = {
+  ...process.env,
+  OD_PORT: String(daemonPort),
+  VITE_PORT: String(vitePort),
+};
+
+// We spawn the local `concurrently` bin via shell so Windows .cmd shims
+// resolve correctly. The `npm:daemon` / `npm:dev` shorthand runs the
+// matching package.json scripts, so any future tweak to those scripts is
+// picked up automatically.
+const child = spawn(
+  'concurrently',
+  ['-k', '-n', 'daemon,web', '-c', 'cyan,magenta', 'npm:daemon', 'npm:dev'],
+  { env, stdio: 'inherit', shell: true },
+);
+
+child.on('exit', (code, signal) => {
+  if (signal) process.kill(process.pid, signal);
+  else process.exit(code ?? 0);
+});
+
+for (const sig of ['SIGINT', 'SIGTERM']) {
+  process.on(sig, () => {
+    if (!child.killed) child.kill(sig);
+  });
+}

vite.config.ts

@@ -2,11 +2,12 @@ import { defineConfig } from 'vite';
 import react from '@vitejs/plugin-react';
 
 const DAEMON_PORT = Number(process.env.OD_PORT) || 7456;
+const VITE_PORT = Number(process.env.VITE_PORT) || 5173;
 
 export default defineConfig({
   plugins: [react()],
   server: {
-    port: 5173,
+    port: VITE_PORT,
     proxy: {
       '/api': {
         target: `http://127.0.0.1:${DAEMON_PORT}`,