This happens in tiny businesses as much as in larger ones. You don't need a programme of work for it to be a problem. You only need a conversation that was meant to change something, and then didn't.
Ten minutes after, before the memory fades
As soon as you can after the meeting, even later the same day, write three short lists: what was decided, who is doing what, and by when. If a point was left open, write that down too, so it isn't mistaken for a decision. You are not writing minutes for a board. You are making a note that a busy person can use.
Send that note to everyone who was there, the same day if you can. A short email is enough. Ask them to say if you've got something wrong. This is slightly uncomfortable the first few times, and then it becomes ordinary, and people start to rely on it.
Put the tasks where you actually look: in the diary, on a list, in the tool you already use to run the work, not only in the email. An action that lives only in a paragraph is easy to lose.
If you convene the same sort of meeting often, keep a simple heading structure and reuse it, so you aren't inventing the shape of the note each time. Date it. Name the people. Leave out the long discussion unless someone really needs the background.
And if no actions came out of the meeting, say so in one line. That's useful too. It stops the meeting from lingering as a thing that might still need doing.
From your notes, a summary you can send
We'd turn your notes into a short summary, a list of tasks, and a draft follow-up email for you to send. You'd approve the wording before it goes anywhere. If you want changes, you make them, and the next one will be closer to how you like to write.
The setup would use the tools you already have for mail and for tasks, in your own accounts, paid for on your card. We'd shape it to the meetings you actually have, not to a formal process you don't need. We charge for that setup, and for preparing the drafts each week or each month if you'd like us to. If we step back, you still have the structure, the headings and the accounts.
This won't make a messy decision tidy after the fact. What it will do is stop a clear decision from dissolving by Friday, and it will give you a trail you can look back at when, in a month, someone asks "what did we say we'd do?"