Initial commit: Kandev with SQLite persistence and agent integration

Features:
- Unified Go binary running Task Service, Agent Manager, and Orchestrator
- SQLite persistence for boards, columns, and tasks
- Docker-based agent execution with ACP message streaming
- Augment Agent integration with session resumption support
- RESTful API for all operations (port 8080)
- In-memory event bus for service communication

Architecture:
- cmd/kandev: Single entry point for all services
- internal/task: Task, board, and column management
- internal/agent: Docker container lifecycle and ACP streaming
- internal/orchestrator: Agent coordination and monitoring
- internal/events: In-memory pub/sub event bus

Documentation:
- README.md: Project overview and quick start
- docs/ARCHITECTURE.md: System architecture (current + planned)
- docs/GETTING_STARTED.md: Development setup guide
- docs/IMPLEMENTATION_PLAN.md: Original microservices plan
- backend/NEXT_STEPS.md: Development roadmap

backend/internal/task/repository/interface.go

@@ -0,0 +1,38 @@
+package repository
+
+import (
+	"context"
+
+	"github.com/kandev/kandev/internal/task/models"
+	v1 "github.com/kandev/kandev/pkg/api/v1"
+)
+
+// Repository defines the interface for task storage operations
+type Repository interface {
+	// Task operations
+	CreateTask(ctx context.Context, task *models.Task) error
+	GetTask(ctx context.Context, id string) (*models.Task, error)
+	UpdateTask(ctx context.Context, task *models.Task) error
+	DeleteTask(ctx context.Context, id string) error
+	ListTasks(ctx context.Context, boardID string) ([]*models.Task, error)
+	ListTasksByColumn(ctx context.Context, columnID string) ([]*models.Task, error)
+	UpdateTaskState(ctx context.Context, id string, state v1.TaskState) error
+
+	// Board operations
+	CreateBoard(ctx context.Context, board *models.Board) error
+	GetBoard(ctx context.Context, id string) (*models.Board, error)
+	UpdateBoard(ctx context.Context, board *models.Board) error
+	DeleteBoard(ctx context.Context, id string) error
+	ListBoards(ctx context.Context) ([]*models.Board, error)
+
+	// Column operations
+	CreateColumn(ctx context.Context, column *models.Column) error
+	GetColumn(ctx context.Context, id string) (*models.Column, error)
+	UpdateColumn(ctx context.Context, column *models.Column) error
+	DeleteColumn(ctx context.Context, id string) error
+	ListColumns(ctx context.Context, boardID string) ([]*models.Column, error)
+
+	// Close closes the repository (for database connections)
+	Close() error
+}
+