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/presenters/src/lib/http/dto/requests.dto.ts

@@ -857,6 +857,19 @@ export class CreateReleaseDto {
 
 export class UpdateReleaseDto extends PartialType(CreateReleaseDto) {}
 
+export class ReleaseNotesDto {
+  @ApiProperty({
+    type: String,
+    nullable: true,
+    maxLength: 20000,
+    description: 'Markdown; null removes the notes',
+  })
+  @ValidateIf((dto: ReleaseNotesDto) => dto.notes !== null)
+  @IsString()
+  @MaxLength(20000)
+  notes!: string | null;
+}
+
 const DAY = /^\d{4}-\d{2}-\d{2}$/;
 
 export class CreateSprintDto {

libs/api/tracker/presenters/src/lib/http/dto/responses.dto.ts

@@ -331,6 +331,12 @@ export class ReleaseDto {
   status!: ReleaseStatus;
   @ApiProperty({ type: String, nullable: true, format: 'date-time' })
   releasedAt!: string | null;
+  @ApiProperty({
+    type: String,
+    nullable: true,
+    description: 'What shipped, told for people (Markdown)',
+  })
+  notes!: string | null;
   @ApiProperty({ format: 'date-time' }) createdAt!: string;
   @ApiProperty() version!: number;
 }
@@ -370,6 +376,13 @@ export class EpicDto {
   @ApiProperty({ type: ChildProgressDto }) progress!: ChildProgressDto;
 }
 
+export class ReleaseNotesDraftDto {
+  @ApiProperty({
+    example: '## v1.4.0\n\n### Novedades\n\n- Pago con tarjeta (WEB-1)\n',
+  })
+  markdown!: string;
+}
+
 export class ReleaseProgressDto {
   @ApiProperty() total!: number;
   @ApiProperty() finished!: number;