[devin-ai-integration]

Summary

Adds SDK clients for the new mtaapi.dev agencies. They reuse the existing client classes, so this is mostly constructor wiring:

mta.mbta / mta.bart / mta.kingCountyMetro / mta.capMetro / mta.pace / mta.triRail / mta.brightline
  // CommuterRailClient on /api/v1/<slug>: stops, routes, routeStops, departures, vehicles, alerts
mta.bayWheels / mta.divvy / mta.bluebikes
  // CitiBikeClient(this, basePath): stations, station, alerts

Type changes:

• CitiBikeClient now takes a basePath argument. citiBike still uses /api/v1/citi-bike.
• CommuterRailMode and the bike mode/source unions are widened to include the new systems.
• CommuterRailStop.parentStation? and CommuterRailRoute.type? (the GTFS route_type) are new.
• StopMode is unchanged: the new agencies aren't in the cross-mode stops snapshot.

The API endpoints these call are in mta-api #107 (MBTA, with the other agencies stacked on it) and #108 (bike shares). The version isn't bumped.

Testing

• bun test passes (25), with new exact-URL tests for mta.mbta and mta.bayWheels.
• bun run typecheck passes.

Link to Devin session: https://app.devin.ai/sessions/8d319beac0174974a184312ce7c14932
Open in Devin Desktop: https://app.devin.ai/desktop/session/8d319beac0174974a184312ce7c14932?variant=devin
Requested by: @gtokman

[devin-ai-integration]

I'll fix CI failures and address comments from users with write access. I'll skip comments containing "(aside)".

• Disable automatic comment, CI, and merge conflict monitoring