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/release-notes.ts

@@ -0,0 +1,59 @@
+import {
+  IssueReadModel,
+  ProjectWorkflow,
+  ReleaseReadModel,
+  StatusCategory,
+} from '@task-stream/api/tracker/domain';
+
+/** How the default types are told in release notes; others use their name. */
+const HEADING: Record<string, string> = {
+  FEATURE: 'Novedades',
+  UI_CHANGE: 'Cambios en la interfaz',
+  BUG: 'Correcciones',
+  TASK: 'Mejoras internas',
+};
+/** Verification work is not news for whoever reads the notes. */
+const LEFT_OUT = new Set(['QA']);
+
+/**
+ * A first draft of a release's notes, in Markdown: its finished tickets
+ * grouped by type (in the project's order of types), newest version header
+ * first. Someone edits it before publishing it; it is never saved by itself.
+ */
+export function draftReleaseNotes(input: {
+  release: ReleaseReadModel;
+  issues: IssueReadModel[];
+  workflow: ProjectWorkflow;
+}): string {
+  const { release, issues, workflow } = input;
+  const done = issues.filter(
+    (i) => i.statusCategory === StatusCategory.DONE && !LEFT_OUT.has(i.type),
+  );
+  const day = release.releasedAt ?? release.targetDate;
+  const date = day
+    ? ` — ${new Date(day).toLocaleDateString('es', {
+        day: 'numeric',
+        month: 'long',
+        year: 'numeric',
+        timeZone: 'UTC',
+      })}`
+    : '';
+  const lines = [`## ${release.name}${date}`];
+  if (release.description) lines.push('', release.description);
+  const order = workflow.settings.issueTypes.map((t) => t.id);
+  const types = [...new Set(done.map((i) => i.type))].sort(
+    (a, b) =>
+      (order.indexOf(a) + 1 || order.length + 1) -
+      (order.indexOf(b) + 1 || order.length + 1),
+  );
+  for (const type of types) {
+    lines.push('', `### ${HEADING[type] ?? workflow.typeName(type)}`, '');
+    for (const issue of done
+      .filter((i) => i.type === type)
+      .sort((a, b) => a.number - b.number))
+      lines.push(`- ${issue.title} (${issue.key})`);
+  }
+  if (!done.length)
+    lines.push('', '_Aún no hay tickets terminados en esta release._');
+  return lines.join('\n') + '\n';
+}