Feat (RAG): tying tui calls to rag funcs [WIP; skip-ci]

RAG itself is annoying to properly implement, plucking sentences with no
context is useless. Also it should not be a part of main package, same
for goes for tui. The number of global vars is absurd.

.gitignore

@@ -6,3 +6,4 @@ history/
 *.db
 config.toml
 sysprompts/*
+history_bak/