Milestone 4 — Reporting Pipelines

LINQ over the store (all inputs are TaskItem lists; no mutation): ``csharp public static class Solution { // "P<projectId>:<openCount>:<doneCount>" ordered by projectId ascending public static System.Collections.Generic.List<string> Progress( System.Collections.Generic.IReadOnlyList<TaskItem> tasks); // ids of open (not Done) tasks of the given priority, highest priority // first, ties by id ascending public static System.Collections.Generic.List<int> Backlog( System.Collections.Generic.IReadOnlyList<TaskItem> tasks, Priority priority); // assigneeId -> count of their open tasks; unassigned (null) tasks are // excluded; absent assignees simply do not appear public static System.Collections.Generic.Dictionary<int, int> Workload( System.Collections.Generic.IReadOnlyList<TaskItem> tasks); } ` Provided types: TaskItem, Priority, Status`.