feat(tournaments): add partnership tracking and tournament management

Implement comprehensive partnership tracking system and tournament
management features including round-robin, single/double elimination,
and Swiss system pairings.

Changes:
- Add partnership_games and partnership_stats tables
- Implement PartnershipTracker service for recording partnership data
- Add tournament generator with multiple formats
- Create tournament management actions and views
- Add acceptance tests for partnership tracking
- Fix PartnershipTracker to use single snapshot per player per match
- Fix round-robin test to query by round_number instead of hardcoded ID

Note: All 8 acceptance tests now passing

db/migrate/20240915000002_enhance_events.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+ROM::SQL.migration do
+  change do
+    # Add new columns to events table
+    alter_table :events do
+      add_column :description, String
+      add_column :event_date, DateTime
+      add_column :event_type, String, default: 'tournament'
+      add_column :format, String, default: 'single_elim'
+      add_column :status, String, default: 'planned'
+      add_column :max_participants, Integer
+      add_column :created_at, DateTime, null: false, default: Sequel::CURRENT_TIMESTAMP
+      add_column :updated_at, DateTime, null: false, default: Sequel::CURRENT_TIMESTAMP
+    end
+
+    # Remove the self-referential column that's not being used
+    # (keeping it for potential nested tournaments in future)
+    # alter_table :events do
+    #   drop_column :event_id
+    # end
+  end
+end

db/migrate/20240915000003_create_teams.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+ROM::SQL.migration do
+  change do
+    create_table :teams do
+      primary_key :id
+      foreign_key :event_id, :events, null: false
+      column :team_name, String
+      column :player_1_id, Integer, null: false
+      column :player_2_id, Integer, null: false
+      column :created_at, DateTime, null: false, default: Sequel::CURRENT_TIMESTAMP
+    end
+
+    add_index :teams, [:event_id, :player_1_id, :player_2_id], unique: true
+  end
+end

db/migrate/20240915000004_create_event_participants.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+ROM::SQL.migration do
+  change do
+    create_table :event_participants do
+      primary_key :id
+      foreign_key :event_id, :events, null: false
+      foreign_key :player_id, :players, null: false
+      foreign_key :team_id, :teams
+      column :status, String, default: 'registered'  # registered, checked_in, active, eliminated
+      column :seed, Integer
+      column :registration_date, DateTime, null: false, default: Sequel::CURRENT_TIMESTAMP
+    end
+
+    add_index :event_participants, [:event_id, :player_id], unique: true
+    add_index :event_participants, [:event_id, :team_id]
+  end
+end

db/migrate/20240915000005_create_tournament_rounds.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+ROM::SQL.migration do
+  change do
+    create_table :tournament_rounds do
+      primary_key :id
+      foreign_key :event_id, :events, null: false
+      column :round_number, Integer, null: false
+      column :status, String, default: 'pending'  # pending, active, completed
+      column :scheduled_start, DateTime
+      column :actual_start, DateTime
+      column :completed_at, DateTime
+    end
+
+    add_index :tournament_rounds, [:event_id, :round_number], unique: true
+  end
+end

db/migrate/20240915000006_create_bracket_matchups.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+ROM::SQL.migration do
+  change do
+    create_table :bracket_matchups do
+      primary_key :id
+      foreign_key :event_id, :events, null: false
+      foreign_key :round_id, :tournament_rounds, null: false
+      foreign_key :match_id, :matches
+      foreign_key :team_1_id, :teams
+      foreign_key :team_2_id, :teams
+      column :bracket_position, Integer
+      column :winner_team_id, Integer
+      column :loser_team_id, Integer
+    end
+
+    add_index :bracket_matchups, [:event_id, :round_id, :bracket_position], unique: true
+  end
+end

db/migrate/20240915000007_create_partnership_games.rb

@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+ROM::SQL.migration do
+  change do
+    # Track each instance of a partnership playing together in a match
+    create_table :partnership_games do
+      primary_key :id
+      foreign_key :match_id, :matches, null: false
+      foreign_key :player_1_id, :players, null: false
+      foreign_key :player_2_id, :players, null: false
+      column :team_number, Integer, null: false  # 1 or 2
+      column :won_match, Integer, null: false  # 0 or 1 (SQLite doesn't have boolean)
+      column :created_at, DateTime, null: false, default: Sequel::CURRENT_TIMESTAMP
+    end
+
+    add_index :partnership_games, [:player_1_id, :player_2_id, :match_id], unique: true
+    add_index :partnership_games, :match_id
+    add_index :partnership_games, [:player_1_id, :player_2_id]
+
+    # Summary statistics for partnerships (denormalized for performance)
+    create_table :partnership_stats do
+      primary_key :id
+      foreign_key :player_1_id, :players, null: false
+      foreign_key :player_2_id, :players, null: false
+      column :games_played, Integer, default: 0
+      column :wins, Integer, default: 0
+      column :losses, Integer, default: 0
+      column :total_elo_change, Integer, default: 0
+      column :last_played, DateTime
+      column :created_at, DateTime, null: false, default: Sequel::CURRENT_TIMESTAMP
+      column :updated_at, DateTime, null: false, default: Sequel::CURRENT_TIMESTAMP
+    end
+
+    add_index :partnership_stats, [:player_1_id, :player_2_id], unique: true
+    add_index :partnership_stats, [:player_2_id, :player_1_id]  # For reverse lookups
+  end
+end