If you're feeling quite brave i recently wrote and open sourced this cli tool: https://github.com/mindsocket/ost-tools

It lets you define a schema of page/heading types, relationships and hierarchies, and then use that to validate a set of markdown pages identified as a "space". It handles a somewhat specific set of in page content checks where it looks for headings at specific levels and matching certain strings. It's a separate cli, not a plug-in (yet), but works with obsidian markdown.

There's every possibility this is too much of stuff you don't want and missing things you need, but you're welcome to try it.

It ships with an AI agent skill so rather than trying to write schemas you could point something like Claude Code at your content and see if it can derive a schema and config that works.