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/queries/get-release-notes-draft.query.ts

@@ -0,0 +1,60 @@
+import { IQueryHandler, Query, QueryHandler } from '@nestjs/cqrs';
+import {
+  DEFAULT_PROJECT_SETTINGS,
+  ProjectWorkflow,
+} from '@task-stream/api/tracker/domain';
+import { FindIssuesRepository } from '../ports/find-issues.repository';
+import { FindProjectsRepository } from '../ports/find-projects.repository';
+import { FindReleasesRepository } from '../ports/find-releases.repository';
+import { draftReleaseNotes } from '../releases/release-notes';
+import { ReadAccess } from './read-access';
+
+/** A Markdown draft of a release's notes, from its finished tickets. */
+export class GetReleaseNotesDraftQuery extends Query<string> {
+  constructor(
+    public readonly viewerId: string | null,
+    public readonly releaseId: string,
+  ) {
+    super();
+  }
+}
+
+@QueryHandler(GetReleaseNotesDraftQuery)
+export class GetReleaseNotesDraftQueryHandler
+  implements IQueryHandler<GetReleaseNotesDraftQuery, string>
+{
+  constructor(
+    private readonly findReleases: FindReleasesRepository,
+    private readonly findIssues: FindIssuesRepository,
+    private readonly findProjects: FindProjectsRepository,
+    private readonly access: ReadAccess,
+  ) {}
+
+  async execute(query: GetReleaseNotesDraftQuery): Promise<string> {
+    const release = this.access.assertFound(
+      await this.findReleases.findById(query.releaseId),
+      'Release',
+      query.releaseId,
+    );
+    await this.access.assertCanView(release.projectId, query.viewerId, {
+      entity: 'Release',
+      ref: query.releaseId,
+    });
+    const [page, project] = await Promise.all([
+      this.findIssues.search({
+        projectId: release.projectId,
+        releaseId: release.id,
+        limit: 500,
+        offset: 0,
+      }),
+      this.findProjects.findById(release.projectId),
+    ]);
+    return draftReleaseNotes({
+      release,
+      issues: page.items,
+      workflow: new ProjectWorkflow(
+        project?.settings ?? DEFAULT_PROJECT_SETTINGS,
+      ),
+    });
+  }
+}