Help me convert the stories in `{file}` into a highly specific product development checklist in a markdown-formatted `checklist.md` file. This markdown-formatted checklist should include everything an LLM pair programmer needs to fully develop this spec, split into incremental work blocks. The pair programmer will work through the checklist step-by-step and test to make sure the app is working as we go. Make sure to include all of the context needed for the LLM to be able to do a great job. Also, make it easy for me, a human engineering manager, to read and follow.