A ctl write fails when a builtin it runs fails, and a missing required argument is refused before anything runs

A ctl write failed only on a malformed line: Mount x reported its error
in the editor while the write succeeded, and a bare Mount failed only as
it ran, after earlier lines of the write. acme's ctl answers a command's
error (editors/acme/xfid.c:700). Builtins now declare requires_arg beside
takes_arg (settings: those with a value to set), and the check refuses a
bare one as wrong #args before any line runs; while a ctl runs, the first
error a builtin reports fails the write, quoted with its line, and the
prompt refusal quotes its line too. Docs say what a failure mid-write
leaves done.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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