refactor(tooling): [MOD-DEV-01] own dev server lifecycle and report port failures

scripts/dev.js

@@ -1,7 +1,26 @@
 import process from 'node:process'
 import { runDevelop } from './library/development.ts'
 
-runDevelop().catch((error) => {
-  console.error('❌ Development server failed:', error)
-  process.exitCode = 1
-})
+const abort = new AbortController()
+const stop = () => abort.abort()
+process.once('SIGINT', stop)
+process.once('SIGTERM', stop)
+
+try {
+  const configured = process.env.ARTPLAYER_DEV_PORT
+  const port = configured === undefined ? 8082 : Number(configured)
+  if (configured?.trim() === '' || !Number.isInteger(port) || port < 0 || port > 65535)
+    throw new Error('ARTPLAYER_DEV_PORT must be an integer from 0 through 65535')
+  const session = await runDevelop({ port, signal: abort.signal })
+  await session?.done
+}
+catch (error) {
+  if (!abort.signal.aborted) {
+    console.error('❌ Development server failed:', error)
+    process.exitCode = 1
+  }
+}
+finally {
+  process.off('SIGINT', stop)
+  process.off('SIGTERM', stop)
+}