Workflow does not respect MAX_LINES when README.md already has activity less than MAX_LINES

I noticed that if my README.md already has entries for activity whose count is less than the MAX_LINES, then the workflow does not respect the MAX_LINES. I need to investigate this further but I noticed this in passing when trying to debug some other issue. I'll investigate it further.

Start by reproducing the workflow with a README.md that already contains activity entries below MAX_LINES, then inspect the workflow entry point and its handling of the existing content. Done means the generated activity respects MAX_LINES in this case and the behavior is covered by an appropriate check or test.

Written by the indexing model from the issue text.