Migrate pharos run start files to project-relative model paths
Source:R/extendr-wrappers.R
migrate_run_start_files.RdRewrites every pharos_start.json under the project root, replacing the
absolute model_canonical_path written by older pharos versions with a
model_path relative to the project root. Files already in the current
format are left untouched. .git and rv directories are skipped.