I try to structure my work in such a way that "git add ." is a sensible thing to do. I stashed or committed outstanding changes before starting on this feature, and I did exactly enough work for one commit since then. And the state of the project right now is what I've built and tested, so it's a good candidate to go into version control.

Changes that are needed to get the project to run right in the dev environment, but that should never be committed, are a smell: I move them to config that doesn't get committed.

Increasingly with agents I'm likely working on multiple features in parallel (I haven't adopted git worktrees but I probably should). Even then I try to lay out code so concurrent changes touch disjoint parts of the codebase, so I can do "git add Widgets/FooWidget/" and the ten files modified under there will be the right things to commit.

Maybe 30% of the time I find I have done work that belongs in multiple commits and I need to break it up. Even then I often end up doing "git add -p ." to interactively pick the parts I want to add.