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/application/src/lib/comments.service.ts

@@ -12,6 +12,7 @@ import { EditCommentCommand } from './commands/edit-comment.command';
 import { ReactToCommentCommand } from './commands/react-to-comment.command';
 import { MarkDecisionCommand } from './commands/mark-decision.command';
 import { ResolveThreadCommand } from './commands/resolve-thread.command';
+import { ClosePollCommand, VotePollCommand } from './commands/polls';
 import { Page } from './ports/find-issues.repository';
 import { GetCommentsQuery } from './queries/get-comments.query';
 import {
@@ -31,9 +32,32 @@ export class CommentsService {
     issueId: string,
     body: string,
     replyTo: string | null = null,
+    poll: string[] | null = null,
   ): Promise<CommandResult> {
     return this.commands.execute(
-      new AddCommentCommand(actorId, issueId, body, replyTo),
+      new AddCommentCommand(actorId, issueId, body, replyTo, poll),
+    );
+  }
+
+  /** Votes in a comment's poll (null takes the vote back). */
+  votePoll(
+    actorId: string,
+    commentId: string,
+    option: number | null,
+  ): Promise<CommandResult> {
+    return this.commands.execute(
+      new VotePollCommand(actorId, commentId, option),
+    );
+  }
+
+  /** Closes a poll; with `decide`, its winner stays as a decision. */
+  closePoll(
+    actorId: string,
+    commentId: string,
+    decide = true,
+  ): Promise<CommandResult> {
+    return this.commands.execute(
+      new ClosePollCommand(actorId, commentId, decide),
     );
   }