Create a helper function `night/z-var-get` which, when brish is available (`night/brish-p`), uses `z var-get`, but falls back on `getenv` when it's not. Use it everywhere we currently use `z var-get`.Create a helper function `night/z-var-get` which, when brish is available (`night/brish-p`), uses `z var-get`, but falls back on `getenv` when it's not. Use it everywhere we currently use `z var-get`.current-kill while locally clearing osx-clipboard-last-selected-text so terminal macOS clipboard sync is not suppressed as already seen.kill-new and must forward optional arguments with &rest so boolean REPLACE values from kill-append remain valid apply tails.md=/=markdown source blocks, converts Markdown clipboard text to Org before sentence-cased insertion.