supermaven off unless asked for; a blocked cask no longer ends install.sh

Supermaven was running everywhere. Its `condition` option reads the other way
round from what the code assumed -- `true` stops it -- so `return false` meant
"never stop", and the plugin loaded on InsertEnter, started its agent and
offered inline suggestions on every machine. Only blink's source for it was
off, which is what made it look disabled. It sends buffer context to a third
party, so it is now opt-in: DOT_SUPERMAVEN=1, in ~/.localenv where it is
wanted. Off, lazy keeps both plugins off disk entirely.

install.sh no longer stops at brew bundle either. A managed machine can refuse
a cask outright -- "disabled because it does not pass the macOS Gatekeeper
check" -- and brew bundle fails the whole run for one such entry, which left
the checkouts, nvim plugins and colour files undone. It warns and carries on;
brew has already named the entry.

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