fix(org): give the F8 agenda window 75% of the frame

The agenda buffer's `display-buffer-alist' rule used `(window-height . fit-window-to-buffer)', so a sparse agenda opened as a sliver a few lines tall. The rule now takes `(window-height . cj/org-agenda-window-height)', a defcustom defaulting to 0.75 (the fraction of the frame the agenda window gets), and the rule itself moved into `cj/--org-agenda-display-rule' so it's testable. New `test-org-agenda-config-display.el' checks that the configured fraction flows through, that it's no longer `fit-window-to-buffer', and (integration) that `display-buffer' produces a window near that size.

`(use-package alert)' gained an `:if (or (not noninteractive) (require 'alert nil t))' guard: the batch test runner loads this module without `package-initialize', so the optional notification package may be installed but not yet on the load path, and the unconditional `:config' setq's would error.

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