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/domain/src/lib/ports/gateways.ts

@@ -336,6 +336,18 @@ export abstract class CommentsGateway {
     issueId: string,
     body: string,
     replyTo?: string | null,
+    /** A quick poll's options (2–6). */
+    poll?: string[] | null,
+  ): Observable<CommandResult>;
+  /** Votes in a comment's poll (null takes the vote back). */
+  abstract votePoll(
+    commentId: string,
+    option: number | null,
+  ): Observable<CommandResult>;
+  /** Closes a poll; with `decide`, its winner stays as a decision. */
+  abstract closePoll(
+    commentId: string,
+    decide: boolean,
   ): Observable<CommandResult>;
   abstract edit(commentId: string, body: string): Observable<CommandResult>;
   /** Adds (`on`) or takes back one's reaction. */