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/web/tracker/infrastructure/src/lib/adapters/graphql-collaboration.gateways.ts

@@ -25,6 +25,8 @@ import {
   ReactToCommentDocument,
   MarkDecisionDocument,
   ResolveThreadDocument,
+  VotePollDocument,
+  ClosePollDocument,
   PublishReleaseDocument,
   ReleaseBurnupDocument,
   ReleaseNotesDraftDocument,
@@ -50,12 +52,33 @@ export class GraphqlCommentsGateway extends CommentsGateway {
     issueId: string,
     body: string,
     replyTo: string | null = null,
+    poll: string[] | null = null,
   ): Observable<CommandResult> {
     return this.gql
-      .mutate(AddCommentDocument, { issueId, body, replyTo })
+      .mutate(AddCommentDocument, {
+        issueId,
+        body,
+        replyTo,
+        poll: poll?.length ? poll : null,
+      })
       .pipe(map((d) => toCommandResult(d.addComment)));
   }
 
+  votePoll(
+    commentId: string,
+    option: number | null,
+  ): Observable<CommandResult> {
+    return this.gql
+      .mutate(VotePollDocument, { commentId, option })
+      .pipe(map((d) => toCommandResult(d.votePoll)));
+  }
+
+  closePoll(commentId: string, decide: boolean): Observable<CommandResult> {
+    return this.gql
+      .mutate(ClosePollDocument, { commentId, decide })
+      .pipe(map((d) => toCommandResult(d.closePoll)));
+  }
+
   react(
     commentId: string,
     emoji: string,