feat(notes): add_note MCP tool with a per-day agent cap

Agents can write into the user's daily notes, but only within limits:
max 10 agent notes a day, max 500 characters, add only — no edit, no
delete. A new from_agent column separates their lines from the user's
so the cap counts the right ones and the UI can mark them.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/ClaudeDo.Worker/Hub/WorkerHub.cs

@@ -970,14 +970,25 @@ public sealed class WorkerHub : Microsoft.AspNetCore.SignalR.Hub
     {
         using var ctx = _dbFactory.CreateDbContext();
         var notes = await new DailyNoteRepository(ctx).ListByDayAsync(Day(dayIso));
-        return notes.Select(n => new DailyNoteDto(n.Id, n.Date.ToString("yyyy-MM-dd"), n.Text, n.SortOrder)).ToList();
+        return notes.Select(Dto).ToList();
     }
 
+    /// <summary>Both ends inclusive — the editor loads today plus its recent history in one call.</summary>
+    public async Task<List<DailyNoteDto>> GetDailyNotesBetween(string startIso, string endIso)
+    {
+        using var ctx = _dbFactory.CreateDbContext();
+        var notes = await new DailyNoteRepository(ctx).ListBetweenAsync(Day(startIso), Day(endIso));
+        return notes.Select(Dto).ToList();
+    }
+
+    private static DailyNoteDto Dto(Data.Models.DailyNoteEntity n) =>
+        new(n.Id, n.Date.ToString("yyyy-MM-dd"), n.Text, n.SortOrder, n.FromAgent);
+
     public async Task<DailyNoteDto> AddDailyNote(string dayIso, string text)
     {
         using var ctx = _dbFactory.CreateDbContext();
         var n = await new DailyNoteRepository(ctx).AddAsync(Day(dayIso), text);
-        return new DailyNoteDto(n.Id, n.Date.ToString("yyyy-MM-dd"), n.Text, n.SortOrder);
+        return Dto(n);
     }
 
     public async Task UpdateDailyNote(string id, string text)