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/releases.controller.ts

@@ -6,6 +6,7 @@ import {
   Param,
   Patch,
   Post,
+  Put,
   Query,
 } from '@nestjs/common';
 import {
@@ -34,6 +35,7 @@ import {
   CreateReleaseDto,
   PageQueryDto,
   PublishReleaseDto,
+  ReleaseNotesDto,
   UpcomingReleasesQueryDto,
   UpdateReleaseDto,
 } from './dto/requests.dto';
@@ -41,6 +43,7 @@ import {
   CommandResultDto,
   IssuePageDto,
   ReleaseDto,
+  ReleaseNotesDraftDto,
   ReleaseBurnupDto,
   ReleaseProgressDto,
 } from './dto/responses.dto';
@@ -194,6 +197,38 @@ export class ReleasesController {
     return this.releases.publish(me.id, releaseId, body.force);
   }
 
+  @Put('releases/:releaseId/notes')
+  @ApiOperation({
+    summary: 'Write the release notes (Markdown)',
+    description: 'Also after the release ships; not once archived.',
+  })
+  @ApiOkResponse({ type: CommandResultDto })
+  @ApiCommandErrors()
+  writeNotes(
+    @CurrentUser() me: User,
+    @Param('releaseId') releaseId: string,
+    @Body() body: ReleaseNotesDto,
+  ) {
+    return this.releases.writeNotes(me.id, releaseId, body.notes);
+  }
+
+  @Get('releases/:releaseId/notes/draft')
+  @ApiOptionalPireonAuth()
+  @ApiOperation({
+    summary: 'A Markdown draft of the notes from the finished tickets',
+    description: 'Grouped by type; nothing is saved.',
+  })
+  @ApiOkResponse({ type: ReleaseNotesDraftDto })
+  @ApiReadErrors()
+  async notesDraft(
+    @CurrentUser() me: User | undefined,
+    @Param('releaseId') releaseId: string,
+  ) {
+    return {
+      markdown: await this.releases.notesDraft(viewerOf(me), releaseId),
+    };
+  }
+
   @Post('releases/:releaseId/archive')
   @HttpCode(200)
   @ApiOperation({ summary: 'Archive a planned release (its tickets leave it)' })