feat: definition of done per project

A project can ask that tickets reach a DONE status only with their
checklist ticked (settings.checklistBeforeDone, off by default; absent
when saving means unchanged). Members get a 422 telling how many steps are
left; owners and admins may still close it. Settings has the switch and
the ticket's checklist says when the project asks for it.

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

libs/api/tracker/application/src/lib/commands/change-issue-status.command-handler.ts

@@ -14,11 +14,14 @@ export class ChangeIssueStatusCommandHandler
       command.issueId,
       command.actorId,
     );
+    const role = project.roleOf(command.actorId);
     issue.changeStatus(
       command.actorId,
       command.status,
       command.reason,
       project.workflow,
+      // The definition of done holds back members, not who runs the project.
+      role === 'OWNER' || role === 'ADMIN',
     );
     await issue.commitAndWait();
     return ack(issue);