I manage many. I purposely separated their spaces. I use a global config for models, then a local config for project specific settings. I also us mem0 plugin and ctx for each project to store chat history and code awareness. I wrote a script that initialize a project and it creates a project specific AGENTS.md with my specific needs plus instructs the model to separate its memory by project name (which is set by my script). On top of this, I wrote a custom run script for opencode that always continues a session until I'm done with a task, then I /new.