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>

apps/api/schema.gql

@@ -304,6 +304,7 @@ type Comment {
   editedAt: String
   id: ID!
   issueId: ID!
+  poll: CommentPoll
 
   """In the order they are offered; only the ones somebody chose"""
   reactions: [CommentReaction!]!
@@ -336,6 +337,15 @@ type CommentPage {
   total: Int!
 }
 
+"""A quick poll in a comment"""
+type CommentPoll {
+  closed: Boolean!
+  options: [PollOption!]!
+
+  """Index of the winning option once closed (null on a tie)"""
+  winner: Int
+}
+
 """One emoji on a comment"""
 type CommentReaction {
   emoji: String!
@@ -964,7 +974,14 @@ type Mutation {
   """
   Comment on a ticket, or answer a comment (replyTo; one level of replies)
   """
-  addComment(body: String!, issueId: ID!, replyTo: ID): CommandResult!
+  addComment(
+    body: String!
+    issueId: ID!
+
+    """A quick poll: 2 to 6 options"""
+    poll: [String!]
+    replyTo: ID
+  ): CommandResult!
 
   """
   Add a repository with its own secret (the first turns the integration on)
@@ -1010,6 +1027,11 @@ type Mutation {
   """Drop my reminder on a ticket"""
   clearReminder(issueId: ID!): Boolean!
 
+  """
+  Close a poll (whoever started it, or an admin); with decide, the winner stays as a decision of the ticket
+  """
+  closePoll(commentId: ID!, decide: Boolean! = true): CommandResult!
+
   """
   Close the sprint under way. Unfinished tickets move to carryOverToSprintId, or back to the backlog when it is null.
   """
@@ -1233,6 +1255,11 @@ type Mutation {
   """
   voteIssue(issueId: ID!, on: Boolean!): CommandResult!
 
+  """
+  Vote in a comment's poll (option index), or take the vote back (null). Members, viewers too
+  """
+  votePoll(commentId: ID!, option: Int): CommandResult!
+
   """
   Follow a ticket: be told when it moves, is reassigned or gets a comment
   """
@@ -1373,6 +1400,11 @@ type OptionCount {
   value: String!
 }
 
+type PollOption {
+  text: String!
+  voters: [UserRef!]!
+}
+
 """
 One of my active projects at a glance: open work, risks, sprint, releases and epics
 """