OCPN Discovery (pm4py)

A second discovery backend for the same Object-Centric Petri Net artifact run.promenade.ocpn (Rust) produces: pm4py's own pm4py.discover_oc_petri_net, run in Pyodide, direct on the OCEL log (pm4py handles every selected object type itself, so no internal projection stage is needed). Renders in either installed OCPN viewer — pick this instead of "Discover OCPN" on the same log to compare pm4py's discovery against the Rust implementation.