feat(gloss): wire gloss into init via :vc against cjennings.net

Adds modules/gloss-config.el with a use-package form that installs
gloss from the cjennings.net bare repo. The bare's post-receive hook
mirrors to GitHub, so the package shows up in both places.

Eager-loaded so gloss-prefix-map exists at startup. :config calls
gloss-install-prefix to bind C-h g.

Lands in the "Modules In Test" section of init.el for v1. Can move
out after the first-week shakedown shows the package is steady.

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