`ssoLocal` in the grafana module read `cfg.enable`, where `cfg` is the
local binding for `services.hyperhive.swarm.grafana` — the option set the
previous commit removed `enable` from. Evaluation fails on the missing
attribute.
The sweep that missed it looked for the option *path*
(`grafana.enable`). This reference is spelled through a `let` alias, so
no grep for the path can find it, and a parse check cannot either: it is
syntactically valid and only wrong once the module system resolves the
attribute.
The check that does find it: for each file, extract the local bindings
that point at the option set being changed, then grep for
`<alias>.<removed-attr>`. Run against this tree it reports nothing for
grafana and sixteen references for authelia, which is the next module to
move.
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