Basic export templates easily handle Markdown → HTML, and Markdown → Markdown. Thanks for the clarifying examples.
But I’ve found RTF → Markdown (writing “normally” in Tinderbox then exporting to Markdown files) more complicated. You can get easily from RTF → HTML (a traditional strength of Tinderbox). But then you have to go through Pandoc to get to Markdown, and use regex to “fix” note-to-note text links that are rendered with an .html extension even if you specify .md.
A short AppleScript currently seems to be the most efficient way to get from RTF to multiple individual Markdown files, especially if you don’t want to export the entire Tinderbox document. A bonus is that this will work with other Tinderbox documents too. You don’t have to configure each new document.
I looking forward to working through and trying to absorb all the great material upthread. Thanks!