feat: add cross-platform release pipeline

build/file-hash.cjs

@@ -0,0 +1,14 @@
+const { createHash } = require('node:crypto')
+const { createReadStream } = require('node:fs')
+
+function sha256File(filePath) {
+  const hash = createHash('sha256')
+  return new Promise((resolve, reject) => {
+    const stream = createReadStream(filePath)
+    stream.on('data', (chunk) => hash.update(chunk))
+    stream.once('error', reject)
+    stream.once('end', () => resolve(hash.digest('hex')))
+  })
+}
+
+module.exports = { sha256File }