feat(transit): register YRT/Viva off, named by Viva colour

York Region's feed is first-party infrastructure under an open licence that
permits commercial use and does not even require attribution. It is the one
feed that fills the gap north of Toronto, and it is switched off anyway.

The operator asks that its licence be accepted through a form collecting a
name, company, phone and email. No credential is issued and nothing gates
the endpoint — the licence body says use is itself acceptance — but a form
asking for contact details is close enough to the registration this registry
refuses that a person should decide it, not a poller. Barrie is off for the
same reason. Both are one line from on.

Viva route ids get labels: YRT publishes `601` where every station sign says
Viva Blue. The numeric local routes already read correctly and carry no
entry, so the table is six lines, not 125.

No vehicle in this feed carries a bearing; heading comes from observed
movement, as with Durham.

docs/CURRENT-STATE.md

@@ -3663,8 +3663,8 @@ gate. Thirteen keyless regions are available: Boston, Austin, Minneapolis–St P
 Helsinki, the Netherlands, Norway, South East Queensland, Toronto (TTC
 surface vehicles; the subway publishes no positions), the Golden Horseshoe
 neighbours MiWay, Hamilton HSR and Durham Region Transit, and Guelph and
-Kingston. Barrie is registered but ships off, pending acceptance of its
-click-through licence. Mode silhouettes
+Kingston. Barrie and YRT/Viva are registered but ship off,
+pending acceptance of their licences. Mode silhouettes
 identify buses, trams, subways, trains, ferries and unclassified vehicles.
 
 Retained transit history uses the same outlier quarantine as live observations and