Native i-PI3.3.1 with two CP2K2026.2 FIST force clients,localUNIXsockets only.3physicalCPUs;server1+clients2,MPI1/OMP1 each.4000x.5fs,oneparticle3D HO,K.05Ha/Bohr2,1u,300K/600K.Original wholephysicalforce/energy gates,all185proposal probability/RNG checks,99acceptednativeevents;nativei-pi-remdsort allproperties/coordinate/force records matchedtoindependenttemperaturejoin.Working-directory allocationindependent.OriginalunmodifiedpurePythonGPLiPIwheel isunpacked onlyinto this working directory;licenseincluded. No sharedenvironment changes. NativeCP2K2026.2 unixnamespace /tmp/qiskit_ matchedbyiPI -S;uniquesocket perworkingdirectory.100step pilot wasdiagnostic,separatefrom4000production. Shorttrajectory teachesexchange,notconvergedthermodynamics.
 Source185/99countsdescribebundledactualexample;parallelsharedRNGmakesfreshtrajectorycountsvary.Everyfreshfulltrajectorycheckedindependently.Actualrunfiguresinplots;source-examplefiguresinreference-plots areexplicitlyseparate.
