UPDATE from BC Ag — it’s not invasive:

Hi Paul,  thanks for the photo and note.  This is a stink bug, but not a Brown Marmorated Stink bug, thankfully.   It is a rough stink bug, Brochymena species, which is actually a predator, and commonly found around the Vancouver area.

We came across an interesting bug on our front door about a week ago. After posting a photo on Facebook, several folks said it was an invasive stink bug. When I went back out to trap it, it had disappeared.

Well, yesterday it reappeared, so I have it in a small plastic container in our freezer.

Some info from the BC government here.