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not sure about your use case. but you either import your markdown files and convert them to svelte components yourself (with remark => json => svelte) or take a preproc like https://github.com/pngwn/MDsveX
Defining scaleable code disciplines is often a good place to start for solving these issues - except for the library ones. The funny thing is that i often find myself not needing libraries when programming in Svelte, because the available tools are often enough to solve our problems. I do feel that the Svelte echosystem is lacking when it comes to component-libraries - the best one I've found so far is the one from IBM. We used this as our main source when developing our own component library.
2-way data binding and unpredictable reactivity: In my experience unpredictable reactivity always happens from poorly laid out logic. The very nature of pure reactivity makes it very hard for our brains to follow complex resolving (see this thread), most of the time (if not always) there is a simpler way to do it. A spaghetti reactive logic will have as many expected outputs as the number of programmers looking at it. A typical illustration of this is over use of dual bindings, setting the same value in several different places (sometimes on different events) and expecting something very specific to happen.