feat: sprints with burndown and carry-over

Plan sprints with dates and a goal, run one at a time per project, and
put tickets in them from the ticket page. The Sprints tab follows the one
under way with its progress and a burndown in tickets or points against
the ideal line. Closing a sprint sends what was left to the next one or
back to the backlog; the board can be filtered by sprint.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/api/tracker/presenters/src/lib/tracker-presenters.module.ts

@@ -18,6 +18,8 @@ import { ReleasesController } from './http/releases.controller';
 import { NotificationsController } from './http/notifications.controller';
 import { SavedFiltersController } from './http/saved-filters.controller';
 import { SavedFilterResolver } from './graphql/saved-filter.resolver';
+import { SprintResolver } from './graphql/sprint.resolver';
+import { SprintsController } from './http/sprints.controller';
 
 /**
  * Driving adapters of the tracker context: GraphQL (queries, mutations,
@@ -48,6 +50,7 @@ import { SavedFilterResolver } from './graphql/saved-filter.resolver';
     ExploreController,
     NotificationsController,
     SavedFiltersController,
+    SprintsController,
   ],
   providers: [
     Refs,
@@ -58,6 +61,7 @@ import { SavedFilterResolver } from './graphql/saved-filter.resolver';
     SubscriptionResolver,
     NotificationResolver,
     SavedFilterResolver,
+    SprintResolver,
   ],
 })
 export class TrackerPresentersModule {