Capitalizing the subject line makes commit logs much easier to read in my opinion. There's a reason we capitalize letters at the beginning of sentences
But it's not the beginning of a sentence. It's supposed to be a continuation of the implicit phrase "When applied this commit will ..." In which case capitalizing makes no sense.
> It's supposed to be a continuation of the implicit phrase "When applied this commit will ..."
No: it's supposed to be written in imperative form. For those of us who are not linguists, it's easiest to explain this as a continuation of that phrase. However, it isn't a continuation. It stands on its own.