plan-v1.txt
I'm building <one sentence>. Stack: <stack>. It will run on <host>.

Plan the smallest version one:
- The screens or steps, in order, from arriving to the moment it's useful.
- The files I'll create, one line each on what they do.
- Anything this stack or host makes harder than it sounds, and what
  you'd do about it.
- What's explicitly left out of version one.

Don't write code yet. Keep it to what one person can finish in a weekend.

Naming the host up front changes the plan. "Store it in a file" and "run a background worker" mean very different things on shared hosting and on a container platform.