feat(prime): wire prompt_override into the daily prep prompt

The prime_schedules.prompt_override column existed end-to-end but was
never populated or read. DailyPrepPrompt.BuildPrompt now takes an
optional override and appends it as an extra paragraph after the fixed
prompt (additive, never a replacement, so a user can't disable the
required get_daily_prep_candidates/set_my_day flow). PrimeRunner passes
schedule.PromptOverride through. The Prime tab in Settings now has a
multiline field per schedule wired to a new PromptOverride property on
PrimeScheduleRowViewModel (blank persists as null).

src/ClaudeDo.Localization/locales/de.json

@@ -75,6 +75,8 @@
       "addSchedule": "+ Zeitplan hinzufügen",
       "removeScheduleTip": "Zeitplan entfernen",
       "dailyPrepMaxTasks": "Max. Aufgaben pro Tag",
+      "promptOverrideLabel": "Prompt-Zusatz",
+      "promptOverridePlaceholder": "Zusätzliche Anweisungen, die für diesen Zeitplan an den Prime-Prompt angehängt werden (optional)",
       "dayMo": "Mo",
       "dayTu": "Di",
       "dayWe": "Mi",

src/ClaudeDo.Localization/locales/en.json

@@ -75,6 +75,8 @@
       "addSchedule": "+ Add schedule",
       "removeScheduleTip": "Remove schedule",
       "dailyPrepMaxTasks": "Max tasks per day",
+      "promptOverrideLabel": "Prompt addition",
+      "promptOverridePlaceholder": "Extra instructions appended to the daily prep prompt for this schedule (optional)",
       "dayMo": "Mo",
       "dayTu": "Tu",
       "dayWe": "We",

src/ClaudeDo.Ui/ViewModels/Modals/Settings/PrimeScheduleRowViewModel.cs

@@ -21,6 +21,7 @@ public sealed partial class PrimeScheduleRowViewModel : ViewModelBase
     [ObservableProperty] private bool _sunday;
     [ObservableProperty] private TimeSpan _timeOfDay;
     [ObservableProperty] private DateTimeOffset? _lastRunAt;
+    [ObservableProperty] private string? _promptOverride;
 
     public string LastRunLabel => LastRunAt is { } v ? v.LocalDateTime.ToString("g") : "—";
 
@@ -58,6 +59,7 @@ public sealed partial class PrimeScheduleRowViewModel : ViewModelBase
         Sunday = (dto.Days & Sun) != 0;
         TimeOfDay = dto.TimeOfDay;
         LastRunAt = dto.LastRunAt;
+        PromptOverride = dto.PromptOverride;
     }
 
     public int DaysMask()
@@ -74,5 +76,6 @@ public sealed partial class PrimeScheduleRowViewModel : ViewModelBase
     }
 
     public PrimeScheduleDto ToDto() =>
-        new(Id, DaysMask(), TimeOfDay, Enabled, LastRunAt, null);
+        new(Id, DaysMask(), TimeOfDay, Enabled, LastRunAt,
+            string.IsNullOrWhiteSpace(PromptOverride) ? null : PromptOverride);
 }

src/ClaudeDo.Ui/Views/Modals/SettingsModalView.axaml

@@ -354,28 +354,35 @@
                     <Border BorderBrush="{DynamicResource LineBrush}" BorderThickness="1"
                             CornerRadius="6" Padding="10,8" Margin="0,0,0,8"
                             Background="{DynamicResource DeepBrush}">
-                      <Grid ColumnDefinitions="Auto,*,Auto,Auto,Auto" ColumnSpacing="8">
-                        <CheckBox Grid.Column="0" IsChecked="{Binding Enabled, Mode=TwoWay}" VerticalAlignment="Center"/>
-                        <StackPanel Grid.Column="1" Orientation="Horizontal" Spacing="4" VerticalAlignment="Center">
-                          <ToggleButton Classes="day-toggle" Content="{loc:Tr settings.prime.dayMo}" IsChecked="{Binding Monday, Mode=TwoWay}"/>
-                          <ToggleButton Classes="day-toggle" Content="{loc:Tr settings.prime.dayTu}" IsChecked="{Binding Tuesday, Mode=TwoWay}"/>
-                          <ToggleButton Classes="day-toggle" Content="{loc:Tr settings.prime.dayWe}" IsChecked="{Binding Wednesday, Mode=TwoWay}"/>
-                          <ToggleButton Classes="day-toggle" Content="{loc:Tr settings.prime.dayTh}" IsChecked="{Binding Thursday, Mode=TwoWay}"/>
-                          <ToggleButton Classes="day-toggle" Content="{loc:Tr settings.prime.dayFr}" IsChecked="{Binding Friday, Mode=TwoWay}"/>
-                          <ToggleButton Classes="day-toggle" Content="{loc:Tr settings.prime.daySa}" IsChecked="{Binding Saturday, Mode=TwoWay}"/>
-                          <ToggleButton Classes="day-toggle" Content="{loc:Tr settings.prime.daySu}" IsChecked="{Binding Sunday, Mode=TwoWay}"/>
-                        </StackPanel>
-                        <TextBox Grid.Column="2"
-                                 Text="{Binding TimeText, Mode=TwoWay}"
-                                 PlaceholderText="HH:mm" MaxLength="5"
-                                 Width="68" VerticalAlignment="Center"/>
-                        <TextBlock Classes="meta" Grid.Column="3" Text="{Binding LastRunLabel}" VerticalAlignment="Center"
-                                   MinWidth="80"/>
-                        <Button Classes="icon-btn" Grid.Column="4" Content="✕"
-                                ToolTip.Tip="{loc:Tr settings.prime.removeScheduleTip}"
-                                Command="{Binding $parent[ItemsControl].((vm:SettingsModalViewModel)DataContext).Prime.RemoveScheduleCommand}"
-                                CommandParameter="{Binding}"/>
-                      </Grid>
+                      <StackPanel Spacing="6">
+                        <Grid ColumnDefinitions="Auto,*,Auto,Auto,Auto" ColumnSpacing="8">
+                          <CheckBox Grid.Column="0" IsChecked="{Binding Enabled, Mode=TwoWay}" VerticalAlignment="Center"/>
+                          <StackPanel Grid.Column="1" Orientation="Horizontal" Spacing="4" VerticalAlignment="Center">
+                            <ToggleButton Classes="day-toggle" Content="{loc:Tr settings.prime.dayMo}" IsChecked="{Binding Monday, Mode=TwoWay}"/>
+                            <ToggleButton Classes="day-toggle" Content="{loc:Tr settings.prime.dayTu}" IsChecked="{Binding Tuesday, Mode=TwoWay}"/>
+                            <ToggleButton Classes="day-toggle" Content="{loc:Tr settings.prime.dayWe}" IsChecked="{Binding Wednesday, Mode=TwoWay}"/>
+                            <ToggleButton Classes="day-toggle" Content="{loc:Tr settings.prime.dayTh}" IsChecked="{Binding Thursday, Mode=TwoWay}"/>
+                            <ToggleButton Classes="day-toggle" Content="{loc:Tr settings.prime.dayFr}" IsChecked="{Binding Friday, Mode=TwoWay}"/>
+                            <ToggleButton Classes="day-toggle" Content="{loc:Tr settings.prime.daySa}" IsChecked="{Binding Saturday, Mode=TwoWay}"/>
+                            <ToggleButton Classes="day-toggle" Content="{loc:Tr settings.prime.daySu}" IsChecked="{Binding Sunday, Mode=TwoWay}"/>
+                          </StackPanel>
+                          <TextBox Grid.Column="2"
+                                   Text="{Binding TimeText, Mode=TwoWay}"
+                                   PlaceholderText="HH:mm" MaxLength="5"
+                                   Width="68" VerticalAlignment="Center"/>
+                          <TextBlock Classes="meta" Grid.Column="3" Text="{Binding LastRunLabel}" VerticalAlignment="Center"
+                                     MinWidth="80"/>
+                          <Button Classes="icon-btn" Grid.Column="4" Content="✕"
+                                  ToolTip.Tip="{loc:Tr settings.prime.removeScheduleTip}"
+                                  Command="{Binding $parent[ItemsControl].((vm:SettingsModalViewModel)DataContext).Prime.RemoveScheduleCommand}"
+                                  CommandParameter="{Binding}"/>
+                        </Grid>
+                        <TextBlock Classes="field-label" Text="{loc:Tr settings.prime.promptOverrideLabel}"/>
+                        <TextBox Text="{Binding PromptOverride, Mode=TwoWay}"
+                                 PlaceholderText="{loc:Tr settings.prime.promptOverridePlaceholder}"
+                                 AcceptsReturn="True" TextWrapping="Wrap"
+                                 MinHeight="48" MaxHeight="120"/>
+                      </StackPanel>
                     </Border>
                   </DataTemplate>
                 </ItemsControl.ItemTemplate>

src/ClaudeDo.Worker/Prime/DailyPrepPrompt.cs

@@ -16,12 +16,18 @@ public static class DailyPrepPrompt
         "--allowedTools", CandidatesTool, SetMyDayTool,
     ];
 
-    public static string BuildPrompt(int maxTasks, DateOnly today) =>
-        ClaudeDo.Data.PromptFiles.Render(
+    public static string BuildPrompt(int maxTasks, DateOnly today, string? promptOverride = null)
+    {
+        var prompt = ClaudeDo.Data.PromptFiles.Render(
             ClaudeDo.Data.PromptKind.DailyPrep,
             new Dictionary<string, string>
             {
                 ["date"] = today.ToString("yyyy-MM-dd"),
                 ["maxTasks"] = maxTasks.ToString(),
             });
+
+        // Additive by design: a schedule's override is appended, never substituted, so a user
+        // can't accidentally break the mcp__claudedo__get_daily_prep_candidates/set_my_day flow.
+        return string.IsNullOrWhiteSpace(promptOverride) ? prompt : $"{prompt}\n\n{promptOverride}";
+    }
 }

src/ClaudeDo.Worker/Prime/PrimeRunner.cs

@@ -56,7 +56,7 @@ public sealed class PrimeRunner : IPrimeRunner
             }
 
             var today = DateOnly.FromDateTime(_clock.Now.LocalDateTime);
-            var prompt = DailyPrepPrompt.BuildPrompt(maxTasks, today);
+            var prompt = DailyPrepPrompt.BuildPrompt(maxTasks, today, schedule.PromptOverride);
             var args = DailyPrepPrompt.BuildArgs(MaxTurns);
 
             using var timeoutCts = CancellationTokenSource.CreateLinkedTokenSource(ct);

tests/ClaudeDo.Data.Tests/PrimeScheduleRepositoryTests.cs

@@ -0,0 +1,67 @@
+using ClaudeDo.Data.Models;
+using ClaudeDo.Data.Repositories;
+using Microsoft.EntityFrameworkCore;
+
+namespace ClaudeDo.Data.Tests;
+
+public sealed class PrimeScheduleRepositoryTests : IDisposable
+{
+    private readonly string _dbPath;
+    private readonly ClaudeDoDbContext _ctx;
+    private readonly PrimeScheduleRepository _repo;
+
+    public PrimeScheduleRepositoryTests()
+    {
+        _dbPath = Path.Combine(Path.GetTempPath(), $"claudedo_prime_{Guid.NewGuid():N}.db");
+        var options = new DbContextOptionsBuilder<ClaudeDoDbContext>()
+            .UseSqlite($"Data Source={_dbPath}")
+            .Options;
+        _ctx = new ClaudeDoDbContext(options);
+        _ctx.Database.EnsureCreated();
+        _repo = new PrimeScheduleRepository(_ctx);
+    }
+
+    public void Dispose()
+    {
+        _ctx.Dispose();
+        foreach (var suffix in new[] { "", "-wal", "-shm" })
+            try { File.Delete(_dbPath + suffix); } catch { }
+    }
+
+    [Fact]
+    public async Task UpsertAsync_then_GetAsync_roundtrips_the_prompt_override()
+    {
+        var entity = new PrimeScheduleEntity { PromptOverride = "Also prioritize anything tagged #urgent." };
+
+        await _repo.UpsertAsync(entity);
+        var found = await _repo.GetAsync(entity.Id);
+
+        Assert.NotNull(found);
+        Assert.Equal("Also prioritize anything tagged #urgent.", found!.PromptOverride);
+    }
+
+    [Fact]
+    public async Task UpsertAsync_with_null_override_persists_as_null()
+    {
+        var entity = new PrimeScheduleEntity { PromptOverride = null };
+
+        await _repo.UpsertAsync(entity);
+        var found = await _repo.GetAsync(entity.Id);
+
+        Assert.NotNull(found);
+        Assert.Null(found!.PromptOverride);
+    }
+
+    [Fact]
+    public async Task UpsertAsync_updates_the_override_on_an_existing_row()
+    {
+        var entity = new PrimeScheduleEntity { PromptOverride = "old override" };
+        await _repo.UpsertAsync(entity);
+
+        entity.PromptOverride = "new override";
+        await _repo.UpsertAsync(entity);
+
+        var found = await _repo.GetAsync(entity.Id);
+        Assert.Equal("new override", found!.PromptOverride);
+    }
+}

tests/ClaudeDo.Worker.Tests/Prime/DailyPrepPromptTests.cs

@@ -15,6 +15,43 @@ public class DailyPrepPromptTests
         Assert.Contains("preparing my workday", prompt);
     }
 
+    [Fact]
+    public void Build_prompt_without_override_matches_the_plain_render()
+    {
+        var today = new DateOnly(2026, 6, 3);
+        var expected = ClaudeDo.Data.PromptFiles.Render(
+            ClaudeDo.Data.PromptKind.DailyPrep,
+            new Dictionary<string, string> { ["date"] = "2026-06-03", ["maxTasks"] = "5" });
+
+        var prompt = DailyPrepPrompt.BuildPrompt(maxTasks: 5, today: today);
+
+        Assert.Equal(expected, prompt);
+    }
+
+    [Fact]
+    public void Build_prompt_appends_override_as_an_additional_paragraph()
+    {
+        var today = new DateOnly(2026, 6, 3);
+        var baseline = DailyPrepPrompt.BuildPrompt(maxTasks: 5, today: today);
+
+        var prompt = DailyPrepPrompt.BuildPrompt(maxTasks: 5, today: today,
+            promptOverride: "Also prioritize anything tagged #urgent.");
+
+        Assert.StartsWith(baseline, prompt);
+        Assert.Contains("Also prioritize anything tagged #urgent.", prompt);
+    }
+
+    [Fact]
+    public void Build_prompt_treats_whitespace_only_override_as_absent()
+    {
+        var today = new DateOnly(2026, 6, 3);
+        var baseline = DailyPrepPrompt.BuildPrompt(maxTasks: 5, today: today);
+
+        var prompt = DailyPrepPrompt.BuildPrompt(maxTasks: 5, today: today, promptOverride: "   ");
+
+        Assert.Equal(baseline, prompt);
+    }
+
     [Fact]
     public void Build_args_allows_only_the_two_tools()
     {