hammerspoon, ghostty: example files for their machine-local configs

ssh and git each ship one; these two hooks were discoverable only by reading
the config that loads them. Both examples carry what is easy to get wrong:
init.lua's hotkey() helper and mod tables are locals, so a local.lua calls
hs.hotkey.bind directly, and a binding there can only be shadowed, never
deleted; in Ghostty a single-value key replaces while keybind accumulates, and
`ignore` is how a binding is switched off rather than added to.

Checked rather than assumed: the lua parses, and the Ghostty example validates
and, dropped in as ~/.config/ghostty-local, does what it says -- font-size,
command and background-opacity replaced, super+shift+n added, alt+enter turned
off.

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