feat: quick polls in comments that end in a decision

«📊 Añadir una encuesta» adds 2 to 6 options to a new comment. Members,
viewers too, vote by clicking an option (one vote each, which they can
change or take back) and see each option's votes as a bar. Whoever
started it, or an admin, closes it with «Cerrar y decidir»: the most
voted wins (none on a tie) and a «Decidido: …» reply marked as a
decision shows above the ticket. Events of the comment (voted, closed).

API: addComment(…, poll), votePoll, closePoll, Comment.poll;
POST /api/comments/{id}/poll/vote and …/poll/close. MCP: add_comment
poll, vote_poll, close_poll.

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

libs/api/tracker/domain/src/lib/events/comment-poll.events.ts

@@ -0,0 +1,31 @@
+import { AutowiredEvent } from '@task-stream/api/shared/domain';
+import { TrackerEvent } from './tracker.event';
+
+/** Someone voted in a comment's poll, changed or took back their vote. */
+@AutowiredEvent
+export class CommentPollVotedEvent extends TrackerEvent {
+  constructor(
+    actorId: string,
+    commentId: string,
+    projectId: string,
+    readonly issueId: string,
+    /** Every vote after the change: user id → option index. */
+    readonly votes: Record<string, number>,
+  ) {
+    super(actorId, commentId, projectId);
+  }
+}
+
+/** A comment's poll was closed; `winner` is null on a tie or no votes. */
+@AutowiredEvent
+export class CommentPollClosedEvent extends TrackerEvent {
+  constructor(
+    actorId: string,
+    commentId: string,
+    projectId: string,
+    readonly issueId: string,
+    readonly winner: number | null,
+  ) {
+    super(actorId, commentId, projectId);
+  }
+}

libs/api/tracker/domain/src/lib/events/index.ts

@@ -18,6 +18,7 @@ export * from './comment-reacted.event';
 export * from './comment-decision-marked.event';
 export * from './comment-thread-resolved.event';
 export * from './issue-review.events';
+export * from './comment-poll.events';
 export * from './comment-deleted.event';
 export * from './release-created.event';
 export * from './release-updated.event';