feat: teams within a project

Projects keep teams of members in their settings (settings.teams; people
outside the project are dropped, teams are archived, not removed; absent
when saving means unchanged). Tickets go to a team (`team`, also filtered
in the list and in MCP search_issues), and a comment mentioning
@[Frontend](team-FRONT) tells each of its members. Settings has the teams
with their members, the ticket a «Equipo» select, the list a team filter,
and «@» offers the teams after the people.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/api/schema.gql

@@ -339,6 +339,9 @@ input CreateIssueInput {
   """When work should start (roadmap), YYYY-MM-DD"""
   startDate: String
   storyPoints: Int
+
+  """A team id"""
+  team: String
   title: String!
 
   """A ticket type id"""
@@ -607,6 +610,9 @@ type Issue {
   status: String!
   statusCategory: StatusCategory!
   storyPoints: Int
+
+  """A team id"""
+  team: String
   title: String!
 
   """In the trash since then; null when it is not"""
@@ -669,6 +675,9 @@ input IssueFilterInput {
   sort: IssueSort = RECENT
   sprintId: ID
   statuses: [String!]
+
+  """Team ids"""
+  teams: [String!]
   types: [String!]
   unassigned: Boolean
 
@@ -1204,6 +1213,7 @@ type ProjectSettings {
   customFields: [CustomFieldDefinition!]!
   issueTypes: [IssueTypeOption!]!
   statuses: [WorkflowStatus!]!
+  teams: [Team!]!
   transitions: [StatusTransitions!]!
 }
 
@@ -1222,6 +1232,9 @@ input ProjectSettingsInput {
   customFields: [CustomFieldDefinitionInput!]
   issueTypes: [IssueTypeOptionInput!]!
   statuses: [WorkflowStatusInput!]!
+
+  """Absent: unchanged. Teams cannot be removed: archive them."""
+  teams: [TeamInput!]
   transitions: [StatusTransitionsInput!]!
 }
 
@@ -1654,6 +1667,21 @@ type Subscription {
   sprintChanged(projectId: ID!): SprintChange!
 }
 
+"""A group of members: tickets go to it; @team mentions tell them all"""
+type Team {
+  archived: Boolean!
+  id: String!
+  memberIds: [ID!]!
+  name: String!
+}
+
+input TeamInput {
+  archived: Boolean! = false
+  id: String!
+  memberIds: [ID!]! = []
+  name: String!
+}
+
 type TeamLoad {
   blocked: Int!
   openPoints: Int!
@@ -1696,6 +1724,9 @@ input UpdateIssueInput {
   """When work should start (roadmap), YYYY-MM-DD"""
   startDate: String
   storyPoints: Int
+
+  """A team id"""
+  team: String
   title: String
   type: String
 }