Re: Daily driver?
I'm sure you thought of this but tools. I had one bike so unreliable I carried every tool to build one. A plastic bag in case you have to go pure bicycle and need to remove engine chain. They be messy.
Cheap, thin rain poncho for surprise rain storms. They fold to nothing.
Spare tube or repair kit. Especially if you have a long commute.
And of course, a back pack or saddle bags. Down the road might want to consider a trailer for shopping.
I think you meant the bike itself. But that's just the stuff that popped into my head