rdocdump: Dump 'R' Package Source, Documentation, and Vignettes into One File

Dump source code, documentation and vignettes of an 'R' package into a single file. Supports installed packages, tar.gz archives, and package source directories. If the package is not installed, only its source is automatically downloaded from CRAN for processing. The output is a single plain text file or a character vector, which is useful to ingest complete package documentation and source into a large language model (LLM) or pass it further to other tools, such as 'ragnar' to create a Retrieval-Augmented Generation (RAG) workflow.