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+ Added optional multiple **process corner** technology lef support (min/max/nom), in addition to the already existing multiple **timing corner** support (ss/tt/ff). This will also be our nomenclature going fwd. + Parasitics extraction now run at all process corners, and multi-corner analysis is run at all three process corners ~ `finishing` -> `signoff` ~ Parasitics extraction and STA are now an independent step instead of being lumped in routing, as part of the signoff block ~ Update OpenROAD ~ Update Open_PDKs, Sky130, and Magic ~ PDK verification made more PDK agnostic outside of env.py ~ Made RCX use LEF files instead of multiple configuration variables/set_rc.tcl ~ `prep_lefs` more or less rewritten - Removed redundant RCX variables - Removed `-order_wires` from various `read_def`s in OpenROAD- deprecated, apparently