Migrating SaaS from Claude + VS Code to DeepSeek V4 Pro: Stay on VS Code or move to Reasonix / Pi?

Hey everyone, ​I’ve been building a large SaaS platform entirely using AI. Up until now, the whole codebase has been built from scratch using Claude Opus inside VS Code. ​Now, I’m planning to make the shift over to DeepSeek V4 Pro. I’m trying to map out the most seamless way to transition, especially regarding project context, and I'd love your take on the best setup: 1-​The Context/Memory File: To keep track of the app's rules, architecture, and database schemas, I've been using a custom tracking file (lik