feat(data): model Prime schedule as weekday bitmask

src/ClaudeDo.Data/Models/PrimeDays.cs

@@ -0,0 +1,16 @@
+namespace ClaudeDo.Data.Models;
+
+[Flags]
+public enum PrimeDays
+{
+    None = 0,
+    Monday = 1,
+    Tuesday = 2,
+    Wednesday = 4,
+    Thursday = 8,
+    Friday = 16,
+    Saturday = 32,
+    Sunday = 64,
+    Weekdays = Monday | Tuesday | Wednesday | Thursday | Friday, // 31
+    All = Weekdays | Saturday | Sunday, // 127
+}

src/ClaudeDo.Data/Models/PrimeScheduleEntity.cs

@@ -3,10 +3,8 @@ namespace ClaudeDo.Data.Models;
 public sealed class PrimeScheduleEntity
 {
     public Guid Id { get; set; } = Guid.NewGuid();
-    public DateOnly StartDate { get; set; }
-    public DateOnly EndDate { get; set; }
+    public PrimeDays Days { get; set; } = PrimeDays.Weekdays;
     public TimeSpan TimeOfDay { get; set; }
-    public bool WorkdaysOnly { get; set; } = true;
     public bool Enabled { get; set; } = true;
     public DateTimeOffset? LastRunAt { get; set; }
     public string? PromptOverride { get; set; }