aldebaran-worker

What a site needs from the Workers runtime and from nothing else: where the log goes, and the deploy's variables. Responses are aldebaran-axum's.

Item	What it is
`write(&Served<R>)`	One request's line to the Worker console at its level (`aldebaran-log`).
`failure(what)`	Something the Worker got wrong, in words that carry no request.
`var(env, name)`	A variable of the deploy.
`switch(env, name)`	A deploy's `on`/`off`; anything else is complained about in the console and runs as off.

Native builds (tests) have no console and write nothing.