feat: release notes

Each release can carry notes in Markdown, written before or after it
ships. A draft is generated from its finished tickets grouped by type, to
edit and copy from the releases page.

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

libs/api/tracker/application/src/lib/releases.service.ts

@@ -10,6 +10,8 @@ import { CommandResult } from './commands/command-result';
 import { CreateReleaseCommand } from './commands/create-release.command';
 import { PublishReleaseCommand } from './commands/publish-release.command';
 import { UpdateReleaseCommand } from './commands/update-release.command';
+import { WriteReleaseNotesCommand } from './commands/write-release-notes.command';
+import { GetReleaseNotesDraftQuery } from './queries/get-release-notes-draft.query';
 import { GetReleaseProgressQuery } from './queries/get-release-progress.query';
 import { GetReleaseQuery } from './queries/get-release.query';
 import { GetUpcomingReleasesQuery } from './queries/get-upcoming-releases.query';
@@ -82,6 +84,24 @@ export class ReleasesService {
     return this.queryBus.execute(new GetUpcomingReleasesQuery(viewerId, limit));
   }
 
+  /** Writes the notes (null removes them); also after the release ships. */
+  writeNotes(
+    actorId: string,
+    releaseId: string,
+    notes: string | null,
+  ): Promise<CommandResult> {
+    return this.commandBus.execute(
+      new WriteReleaseNotesCommand(actorId, releaseId, notes),
+    );
+  }
+
+  /** A Markdown draft from the release's finished tickets (not saved). */
+  notesDraft(viewerId: string | null, releaseId: string): Promise<string> {
+    return this.queryBus.execute(
+      new GetReleaseNotesDraftQuery(viewerId, releaseId),
+    );
+  }
+
   progress(
     viewerId: string | null,
     releaseId: string,