iyi 0.15.2

Two packages can each have a util. A package's modules now live under
its name - its path's last segment, - as _, a /vN left off - so two
packages that each have util.iyi are Pa::Util and Pb::Util rather
than one type both define, which refused any program that required both.
A module whose path already begins with the name, as iyi-web's iyi_web/dsl
does, is where it was; one that does not is reached by a qualified name one
segment longer, Liba::Colors for import .../liba/colors, and code that
spelled it Colors from outside the package writes the longer name now.

A package's reach can be a limit. require PATH vX reaches std/file, C,
or reaches nothing, says what that package may touch outside the language,
in iyi mod reach's words; a version past it is refused by name before
iyi.sum or iyi.mod is written, and get keeps the clause.

Windows collects beside the program, and gates stop flaking. A
collection on Windows marks and sweeps with its helper threads beside the
running program, as on Linux and darwin, and a fiber reading stdin parks
there. std_signal's TERM step, which lost its output file in one run in
three under load, holds - a killer subshell ran the gate's own cleanup -
and so do the language server's and the collector's Windows gates.