feat: templates per ticket type

Each ticket type can carry a starting description and a checklist, edited
in the project settings. New tickets of that type get the description
when they come without one and always get the checklist; the new ticket
form says what the template will add.

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

libs/api/tracker/application/src/lib/commands/commands.spec.ts

@@ -18,6 +18,7 @@ import {
   IssueType,
   ProjectRole,
   TRACKER_FACTORIES,
+  defaultProjectSettings,
 } from '@task-stream/api/tracker/domain';
 import {
   FakeUserDirectory,
@@ -77,6 +78,7 @@ import { DeleteCommentCommand } from './delete-comment.command';
 import { PublishReleaseCommand } from './publish-release.command';
 import { SetIssueReleaseCommand } from './set-issue-release.command';
 import { WriteAccess } from './write-access';
+import { UpdateProjectSettingsCommand } from './update-project-settings.command';
 import { ReadAccess } from '../queries/read-access';
 import { FindProjectsRepository } from '../ports/find-projects.repository';
 
@@ -595,6 +597,35 @@ describe('tracker commands (event sourced)', () => {
     ).toBe('No sprint is under way');
   });
 
+  it("fills a new ticket with its type's template", async () => {
+    const { run, rehydrator } = await setup();
+    const projectId = await projectWithTeam(run);
+    const settings = defaultProjectSettings();
+    settings.issueTypes[0].template = {
+      description: '## Pasos para reproducir',
+      checklist: ['Probar en Safari', 'Adjuntar captura'],
+    };
+    await run(new UpdateProjectSettingsCommand('owner', projectId, settings));
+    const plain = await run(
+      new CreateIssueCommand('qa', projectId, IssueType.BUG, 'Crash', {}),
+    );
+    const written = await run(
+      new CreateIssueCommand('qa', projectId, IssueType.BUG, 'Crash 2', {
+        description: 'Ya lo explico yo',
+      }),
+    );
+
+    const first = await rehydrator.rehydrate(plain.id, Issue);
+    expect(first.description).toBe('## Pasos para reproducir');
+    expect(first.checklist.map((i) => i.text)).toEqual([
+      'Probar en Safari',
+      'Adjuntar captura',
+    ]);
+    expect((await rehydrator.rehydrate(written.id, Issue)).description).toBe(
+      'Ya lo explico yo',
+    );
+  });
+
   it('does not let viewers modify tickets', async () => {
     const { run } = await setup();
     const projectId = await projectWithTeam(run);