feat: teams within a project

Projects keep teams of members in their settings (settings.teams; people
outside the project are dropped, teams are archived, not removed; absent
when saving means unchanged). Tickets go to a team (`team`, also filtered
in the list and in MCP search_issues), and a comment mentioning
@[Frontend](team-FRONT) tells each of its members. Settings has the teams
with their members, the ticket a «Equipo» select, the list a team filter,
and «@» offers the teams after the people.

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

libs/api/tracker/application/src/lib/notifications/notifications.event-handler.ts

@@ -8,6 +8,9 @@ import {
   IssueStatusChangedEvent,
   IssueUpdatedEvent,
   mentionedUserIds,
+  DEFAULT_PROJECT_SETTINGS,
+  ProjectWorkflow,
+  TEAM_MENTION_PREFIX,
   NotificationKind,
   ProjectMemberAddedEvent,
   ProjectRole,
@@ -195,7 +198,12 @@ export class NotificationsEventHandler implements IEventHandler<TrackerEvent> {
     if (event instanceof CommentAddedEvent) {
       const said = `«${excerpt(event.comment.body)}»`;
       // Only members: a mention cannot reach someone who cannot read the ticket.
-      for (const userId of mentionedUserIds(event.comment.body)) {
+      // A team's mention (`team-FRONTEND`) reaches each of its members.
+      const workflow = new ProjectWorkflow(
+        project.settings ?? DEFAULT_PROJECT_SETTINGS,
+      );
+      const named = mentionedUserIds(event.comment.body);
+      for (const userId of named) {
         if (!memberIds.has(userId)) continue;
         drafts.push({
           userId,
@@ -203,6 +211,19 @@ export class NotificationsEventHandler implements IEventHandler<TrackerEvent> {
           summary: `${actor} te mencionó en ${issue.key}: ${said}`,
         });
       }
+      for (const id of named.filter((n) => n.startsWith(TEAM_MENTION_PREFIX))) {
+        const team = workflow.teams.find(
+          (t) => t.id === id.slice(TEAM_MENTION_PREFIX.length),
+        );
+        for (const userId of workflow.mentionedPeople([id])) {
+          if (!memberIds.has(userId)) continue;
+          drafts.push({
+            userId,
+            kind: NotificationKind.MENTIONED,
+            summary: `${actor} mencionó a tu equipo ${team?.name ?? ''} en ${issue.key}: ${said}`,
+          });
+        }
+      }
       const answered = event.comment.replyTo
         ? await this.findComments.findById(event.comment.replyTo)
         : null;