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/models/models.ts

@@ -379,6 +379,8 @@ export interface Comment {
   decision: boolean;
   /** Who marked it as a decision (null when it is not one). */
   decidedBy: UserRef | null;
+  /** A quick poll in it, if any. */
+  poll: CommentPoll | null;
   /** A conversation (top-level comment and its replies) that was settled. */
   resolved: boolean;
   /** Who settled it (null while open). */
@@ -387,6 +389,14 @@ export interface Comment {
   editedAt: string | null;
 }
 
+/** A quick poll in a comment: each option with who voted it. */
+export interface CommentPoll {
+  options: { text: string; voters: UserRef[] }[];
+  closed: boolean;
+  /** Index of the winning option once closed (null on a tie). */
+  winner: number | null;
+}
+
 /** A decision found by its text, with its ticket. */
 export interface Decision {
   comment: Comment;

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. */