fix(watch): capture Windows file identity before external moves

internal/watch/snapshot_windows.go

@@ -0,0 +1,16 @@
+package watch
+
+import (
+	"errors"
+	"os"
+)
+
+func snapshotInfo(path string) (os.FileInfo, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	// File.Stat captures the file ID from its open handle, before external renames.
+	info, err := file.Stat()
+	return info, errors.Join(err, file.Close())
+}