Create RELEASE_CHANGELOG.md

Author: optionsome

digitransit/RELEASE_CHANGELOG.md

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+# Digitransit OTP Release Summary
+
+## Changelog _20260428_ vs _upstream/dev-2.x_
+
+### Added PRs
+- Add NO_DIRECT_MODE_CONNECTION routing error code for direct-only searches [#7494](https://github.com/opentripplanner/OpenTripPlanner/pull/7494)
+- De-duplicate boardinglocations on areas [#7508](https://github.com/opentripplanner/OpenTripPlanner/pull/7508)
+- Speed up tag lookup during OSM processing [#7536](https://github.com/opentripplanner/OpenTripPlanner/pull/7536)
+- Include entrances that are part of a stop area relation, change build config field `includeOsmSubwayEntrances` to `includeOsmStationEntrances` [#7170](https://github.com/opentripplanner/OpenTripPlanner/pull/7170)
+- Add application warmup feature to run routing queries during startup [#7509](https://github.com/opentripplanner/OpenTripPlanner/pull/7509)
+- Add `startupRetryPeriod` to GBFS feed configuration [#7525](https://github.com/opentripplanner/OpenTripPlanner/pull/7525)
+- Add support for transit group priority in the GTFS API [#7451](https://github.com/opentripplanner/OpenTripPlanner/pull/7451)
+- Set default fares to  [#7545](https://github.com/opentripplanner/OpenTripPlanner/pull/7545)
+- Reduce memory consumption when parsing very large NeTEx files [#7563](https://github.com/opentripplanner/OpenTripPlanner/pull/7563)
+- Remove relation route name application [#7539](https://github.com/opentripplanner/OpenTripPlanner/pull/7539)
+- Skip transit search when no access or egress mode is set [#7547](https://github.com/opentripplanner/OpenTripPlanner/pull/7547)
+- Skip leg rebuild when fare/alert decoration would be a no-op [#7546](https://github.com/opentripplanner/OpenTripPlanner/pull/7546)
+- Replace C2-based pass-through with via-connection chaining [#7496](https://github.com/opentripplanner/OpenTripPlanner/pull/7496)