snapshot_package_paths returns a script string reproducing the caller's tcl:™️:list, auto_path, and package prefer for use in thread::create init scripts. With -libunknown 1 it also copies the punk::libunknown epoch and sources+inits libunknown in the target. interp_sync_package_paths now propagates package prefer (was missing) and accepts optional -libunknown 1 flag for epoch copy + libunknown init in the child interp. Both procs have PUNKARGS argdoc documentation. Includes 6 tcltest tests covering basic propagation, version selection with package prefer latest, ordering preservation, snapshot script validity, -libunknown flag, and regression.