PHLEGM v8 checkpoint 81: GUI caption

Primary GUI (Windows and Linux): ucwords(<$proper>) v<$version> r<$checkpoint>.
When checkpoint.current is empty or absent, the revision token and its
preceding space are omitted entirely (never r0).

Examples:
branding.display=phlegmulator, version.current=8, checkpoint.current=81
  -> Phlegmulator v8 r81
branding.display=phlegmulator, version.current=8, checkpoint.current=
  -> Phlegmulator v8

This changes the shared MasterProductTitle result and the primary GUI
caption, without changing executable names, internal directory labels,
or bootstrap compiler behavior. Existing End-User packaging and CHOP
changes are preserved from checkpoint 80.
