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/presenters/src/lib/http/comments.controller.ts

@@ -19,8 +19,10 @@ import { CommentsService } from '@task-stream/api/tracker/application';
 import { REACTIONS } from '@task-stream/api/tracker/domain';
 import {
   CommentBodyDto,
+  ClosePollDto,
   ReactToCommentDto,
   ResolveThreadDto,
+  VotePollDto,
 } from './dto/requests.dto';
 import { CommandResultDto } from './dto/responses.dto';
 
@@ -82,6 +84,39 @@ export class CommentsController {
     return this.comments.markDecision(me.id, commentId, false);
   }
 
+  @Post(':commentId/poll/vote')
+  @HttpCode(200)
+  @ApiOperation({
+    summary: "Vote in a comment's poll (members, viewers too)",
+    description: 'option: its index; null takes the vote back.',
+  })
+  @ApiOkResponse({ type: CommandResultDto })
+  @ApiCommandErrors()
+  votePoll(
+    @CurrentUser() me: User,
+    @Param('commentId') commentId: string,
+    @Body() body: VotePollDto,
+  ) {
+    return this.comments.votePoll(me.id, commentId, body.option);
+  }
+
+  @Post(':commentId/poll/close')
+  @HttpCode(200)
+  @ApiOperation({
+    summary: 'Close a poll (whoever started it, or an admin)',
+    description:
+      'With decide (default), the winner stays as a decision of the ticket.',
+  })
+  @ApiOkResponse({ type: CommandResultDto })
+  @ApiCommandErrors()
+  closePoll(
+    @CurrentUser() me: User,
+    @Param('commentId') commentId: string,
+    @Body() body: ClosePollDto,
+  ) {
+    return this.comments.closePoll(me.id, commentId, body.decide ?? true);
+  }
+
   @Put(':commentId/resolution')
   @ApiOperation({
     summary: 'Settle a conversation (a top-level comment and its replies)',