Get or set the session project root. When set, reproducible scripts,
figures, report Rmd files, and saved models are written under
<dir>/scripts/, <dir>/figures/, <dir>/reports/, and <dir>/models/
respectively. The pin is also written to <dir>/.certara-mcp/session.json
and restored automatically after a server restart.
Examples
mcp_session_project_dir(tempdir())
#> [1] "C:/Users/jcraig/AppData/Local/Temp/RtmpWOWovW"
mcp_session_project_dir()
#> [1] "C:/Users/jcraig/AppData/Local/Temp/RtmpWOWovW"