Kanboard API returns int (ID) on success and false (bool) on failure
for create operations. Add IntOrFalse type that handles both cases
and update CreateTask, CreateComment, CreateTag, CreateTaskFile, and
CreateTaskLink to use it.
- SearchTasksGlobally: cross-project search using errgroup
- Gets all projects, then searches each in parallel
- Results aggregated from all accessible projects
- Context cancellation propagates to all goroutines
- Single project failure cancels remaining searches
- Added golang.org/x/sync/errgroup dependency
- Comprehensive test coverage
- SearchTasks: search tasks using Kanboard query syntax
- MoveTaskPosition: move task to specific position in column/swimlane
- MoveTaskToProject: move task to different project
- Comprehensive test coverage for all methods
- GetTask: retrieve single task by ID
- GetAllTasks: retrieve all tasks for a project with status filter
- CreateTask: create new task and return the created task
- UpdateTask: partial updates via pointer fields
- CloseTask/OpenTask: status operations with proper error handling
- Returns ErrTaskNotFound, ErrTaskClosed, ErrTaskOpen as appropriate
- Comprehensive test coverage for all methods and edge cases
