feat(ui): Mission Control Recent Sessions mit verschachtelten Handoffs

Neue Tabelle mission_control_sessions (Migration AddMissionControlSessions), befuellt vom
InteractiveLaunchSpecService bei Task-, Ad-hoc- und Handoff-Kacheln. Flyout im Mission-Control-Header
listet die letzten 14 Tage / 50 Sessions, Handoffs eingerueckt unter ihrer Ursprungs-Session, mit
Fortsetzen (--resume im gespeicherten cwd) und Brief anzeigen.

src/ClaudeDo.Data/CLAUDE.md

@@ -24,6 +24,7 @@ Shared data layer: models, repositories, SQLite infrastructure, and git operatio
 - **WeekReportEntity** — Id, StartDate/EndDate (DateOnly), Markdown, GeneratedAt → `week_reports`, unique index on (start_date, end_date)
 - **TaskAttachmentEntity** — Id, TaskId (FK, ON DELETE CASCADE), FileName, ByteSize, CreatedAt → `task_attachments`
 - **TaskDependencyEntity** — one declared "run after" edge: TaskId + DependsOnTaskId, composite PK, table `task_dependencies`. Both FKs are `ON DELETE CASCADE`, which is what the old single `depends_on_task_id` column got from `ON DELETE SET NULL`: deleting a predecessor drops the edge so the dependent becomes pickable instead of blocked on a task that's gone. Written **only** by `TaskStateService.SetDependsOnAsync`.
+- **MissionControlSessionEntity** — SessionId (PK), Cwd, TaskId (no FK), Title, StartedAt, PredecessorSessionId, BriefPath → `mission_control_sessions`. Index behind Mission Control's "Recent sessions" flyout; written only by `InteractiveLaunchSpecService` (task/ad-hoc/handoff tile launches), insert-if-absent → [conpty-sessions](../../docs/explore-notes/conpty-sessions.md).
 - **SubtaskEntity**, **AgentInfo** — subtasks / record for scanned agent files
 
 ### AppSettingsEntity
@@ -120,6 +121,7 @@ Tables (one per line so parallel migrations don't collide on the same line):
 - `task_attachments`
 - `task_dependencies`
 - `list_folders`
+- `mission_control_sessions`
 
 Managed by EF Core migrations in `Migrations/`. **The 40 incremental migrations were squashed into
 a single `20260826094154_InitialCreate` on 2026-08-26** — the schema history is git history now,

src/ClaudeDo.Data/ClaudeDoDbContext.cs

@@ -54,6 +54,7 @@ public class ClaudeDoDbContext : DbContext
     public DbSet<DailyNoteEntity> DailyNotes => Set<DailyNoteEntity>();
     public DbSet<WeekReportEntity> WeekReports => Set<WeekReportEntity>();
     public DbSet<SessionSkillEntity> SessionSkills => Set<SessionSkillEntity>();
+    public DbSet<MissionControlSessionEntity> MissionControlSessions => Set<MissionControlSessionEntity>();
 
     private static readonly ValueConverter<DateTime, DateTime> UtcConverter =
         new(v => v, v => DateTime.SpecifyKind(v, DateTimeKind.Utc));

src/ClaudeDo.Data/Configuration/MissionControlSessionEntityConfiguration.cs

@@ -0,0 +1,22 @@
+using ClaudeDo.Data.Models;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ClaudeDo.Data.Configuration;
+
+public class MissionControlSessionEntityConfiguration : IEntityTypeConfiguration<MissionControlSessionEntity>
+{
+    public void Configure(EntityTypeBuilder<MissionControlSessionEntity> builder)
+    {
+        builder.ToTable("mission_control_sessions");
+        builder.HasKey(s => s.SessionId);
+        builder.Property(s => s.SessionId).HasColumnName("session_id").ValueGeneratedNever();
+        builder.Property(s => s.Cwd).HasColumnName("cwd").IsRequired();
+        builder.Property(s => s.TaskId).HasColumnName("task_id");
+        builder.Property(s => s.Title).HasColumnName("title").IsRequired();
+        builder.Property(s => s.StartedAt).HasColumnName("started_at").IsRequired();
+        builder.Property(s => s.PredecessorSessionId).HasColumnName("predecessor_session_id");
+        builder.Property(s => s.BriefPath).HasColumnName("brief_path");
+        builder.HasIndex(s => s.StartedAt);
+    }
+}

src/ClaudeDo.Data/Migrations/20260928100316_AddMissionControlSessions.cs

@@ -0,0 +1,44 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace ClaudeDo.Data.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddMissionControlSessions : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "mission_control_sessions",
+                columns: table => new
+                {
+                    session_id = table.Column<string>(type: "TEXT", nullable: false),
+                    cwd = table.Column<string>(type: "TEXT", nullable: false),
+                    task_id = table.Column<string>(type: "TEXT", nullable: true),
+                    title = table.Column<string>(type: "TEXT", nullable: false),
+                    started_at = table.Column<DateTime>(type: "TEXT", nullable: false),
+                    predecessor_session_id = table.Column<string>(type: "TEXT", nullable: true),
+                    brief_path = table.Column<string>(type: "TEXT", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_mission_control_sessions", x => x.session_id);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_mission_control_sessions_started_at",
+                table: "mission_control_sessions",
+                column: "started_at");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "mission_control_sessions");
+        }
+    }
+}

src/ClaudeDo.Data/Migrations/ClaudeDoDbContextModelSnapshot.cs

@@ -403,6 +403,45 @@ namespace ClaudeDo.Data.Migrations
                     b.ToTable("list_folders", (string)null);
                 });
 
+            modelBuilder.Entity("ClaudeDo.Data.Models.MissionControlSessionEntity", b =>
+                {
+                    b.Property<string>("SessionId")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("session_id");
+
+                    b.Property<string>("BriefPath")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("brief_path");
+
+                    b.Property<string>("Cwd")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("cwd");
+
+                    b.Property<string>("PredecessorSessionId")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("predecessor_session_id");
+
+                    b.Property<DateTime>("StartedAt")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("started_at");
+
+                    b.Property<string>("TaskId")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("task_id");
+
+                    b.Property<string>("Title")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("title");
+
+                    b.HasKey("SessionId");
+
+                    b.HasIndex("StartedAt");
+
+                    b.ToTable("mission_control_sessions", (string)null);
+                });
+
             modelBuilder.Entity("ClaudeDo.Data.Models.PrimeScheduleEntity", b =>
                 {
                     b.Property<Guid>("Id")

src/ClaudeDo.Data/Models/MissionControlSessionEntity.cs

@@ -0,0 +1,27 @@
+namespace ClaudeDo.Data.Models;
+
+/// <summary>One claude session started in a Mission Control tile (ad-hoc, task or handoff) — the
+/// index behind "Recent sessions". The transcript itself stays with Claude Code.</summary>
+public sealed class MissionControlSessionEntity
+{
+    /// <summary>The claude session id (`--session-id` / `--resume`).</summary>
+    public string SessionId { get; init; } = string.Empty;
+
+    /// <summary>Working directory the session ran in — a resume must start there.</summary>
+    public string Cwd { get; set; } = string.Empty;
+
+    /// <summary>Task the tile belonged to; null for an ad-hoc tile. No FK: the row outlives the task.</summary>
+    public string? TaskId { get; set; }
+
+    /// <summary>Tile title at start (task title or folder name; a handoff inherits its predecessor's).</summary>
+    public string Title { get; set; } = string.Empty;
+
+    /// <summary>UTC time the session was first launched.</summary>
+    public DateTime StartedAt { get; set; } = DateTime.UtcNow;
+
+    /// <summary>Session this one was handed off from; null unless it is a handoff session.</summary>
+    public string? PredecessorSessionId { get; set; }
+
+    /// <summary>brief.md the session started from; non-null exactly for handoff sessions.</summary>
+    public string? BriefPath { get; set; }
+}

src/ClaudeDo.Data/Repositories/MissionControlSessionRepository.cs

@@ -0,0 +1,34 @@
+using ClaudeDo.Data.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace ClaudeDo.Data.Repositories;
+
+/// <summary>Reads and writes <c>mission_control_sessions</c>.</summary>
+public sealed class MissionControlSessionRepository
+{
+    private readonly ClaudeDoDbContext _context;
+
+    public MissionControlSessionRepository(ClaudeDoDbContext context) => _context = context;
+
+    /// <summary>Inserts the session unless it is already recorded — a resumed task session keeps
+    /// its original row and start time.</summary>
+    public async Task RecordAsync(MissionControlSessionEntity session, CancellationToken ct = default)
+    {
+        if (await _context.MissionControlSessions.AnyAsync(s => s.SessionId == session.SessionId, ct)) return;
+        _context.MissionControlSessions.Add(session);
+        await _context.SaveChangesAsync(ct);
+    }
+
+    /// <summary>The recorded session, or null.</summary>
+    public async Task<MissionControlSessionEntity?> GetAsync(string sessionId, CancellationToken ct = default) =>
+        await _context.MissionControlSessions.AsNoTracking().FirstOrDefaultAsync(s => s.SessionId == sessionId, ct);
+
+    /// <summary>Sessions started since <paramref name="sinceUtc"/>, newest first, at most <paramref name="max"/>.</summary>
+    public async Task<IReadOnlyList<MissionControlSessionEntity>> ListRecentAsync(
+        DateTime sinceUtc, int max, CancellationToken ct = default) =>
+        await _context.MissionControlSessions.AsNoTracking()
+            .Where(s => s.StartedAt >= sinceUtc)
+            .OrderByDescending(s => s.StartedAt)
+            .Take(max)
+            .ToListAsync(ct);
+}