feat(transit): add MiWay, Hamilton HSR and Durham Region Transit

Three keyless GTFS-Realtime feeds around Toronto, each verified live: all
vehicles carry real coordinates, and each is polled only near its own
region rather than across the Golden Horseshoe.

The licences differ in ways the registry now records rather than flattens:
Hamilton PRESCRIBES its attribution wording, so the credit is that exact
sentence; Durham makes credit optional and its catalogued licence PDF is
dead after a site relaunch, so licenseUrl points at the live page where the
v.1.0 text was actually read; Mississauga's licence is revocable and asks
that the terms travel with the data, so licenseUrl is the terms themselves.

All three are bus-only and set no route hint, so their modes default rather
than resolve. Durham publishes no bearing on any vehicle — heading comes
from observed movement, as with any feed that omits it.

GO Transit / Metrolinx stays out: its feed requires an API key.

docs/CURRENT-STATE.md

@@ -3659,9 +3659,10 @@ Transit is off by default, and share links use token `j`. The movement panel ord
 places Transit directly after Street Traffic and before Bike Share. Cameras and
 utilities retain their own groups. The layer polls
 registered feeds near the camera every 15 seconds, below a 3,000 km altitude
-gate. Eight keyless regions are available: Boston, Austin, Minneapolis–St Paul,
-Helsinki, the Netherlands, Norway, South East Queensland and Toronto (TTC
-surface vehicles; the subway publishes no positions). Mode silhouettes
+gate. Eleven keyless regions are available: Boston, Austin, Minneapolis–St Paul,
+Helsinki, the Netherlands, Norway, South East Queensland, Toronto (TTC
+surface vehicles; the subway publishes no positions), and the Golden
+Horseshoe neighbours MiWay, Hamilton HSR and Durham Region Transit. Mode silhouettes
 identify buses, trams, subways, trains, ferries and unclassified vehicles.
 
 Retained transit history uses the same outlier quarantine as live observations and