I am not advanced enough in OSM editing to add boundaries, but since the incorporation of Ērgļu Novads into Madonas Novads in 2021, there seems to be a missing level of detail in the OSM adimistrative levels around Ērgļi.

Can somebody add Ērgļu Pagasts into the map?

According to a map book I have, Sprīdīša iela should be here instead of between Aplokciema & Ostas ielas. However, most of it seems to be behind a fence and covered in mounds of scrap metal according to the aerial imagery...

Can anybody confirm?

As far as I can tell, this service road is inaccessible to the public. The TEC-1 area seems to have no public access. I suggest to change the "Allowed Access" settings to "Private."

Is this city border accurate? Surely it doesn't actually cross a tiny section of Lejasvīgantu iela at the bend in the road...

I do not know enough to make a change myself. The shape of the border seems to match the .dxf file from georiga.eu, but maybe the corner is incorrectly placed?