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/Program.cs

@@ -355,7 +355,9 @@ if (cfg.ExternalMcpPort > 0)
     externalBuilder.Services.AddScoped<TaskWaitMcpTools>();
     externalBuilder.Services.AddScoped<QueueStateMcpTools>();
     externalBuilder.Services.AddScoped<AttachmentMcpTools>();
+    externalBuilder.Services.AddScoped<DailyNoteRepository>();
     externalBuilder.Services.AddScoped<FindingsMcpTools>();
+    externalBuilder.Services.AddScoped<NotesMcpTools>();
     externalBuilder.Services.AddMcpServer()
         .WithHttpTransport(o => o.Stateless = true)
         .WithRequestFilters(f => f.AddCallToolFilter(ExternalMcpExceptionFilter.Wrap))
@@ -371,7 +373,8 @@ if (cfg.ExternalMcpPort > 0)
         .WithTools<TaskWaitMcpTools>()
         .WithTools<QueueStateMcpTools>()
         .WithTools<AttachmentMcpTools>()
-        .WithTools<FindingsMcpTools>();
+        .WithTools<FindingsMcpTools>()
+        .WithTools<NotesMcpTools>();
     externalBuilder.WebHost.UseUrls($"http://127.0.0.1:{cfg.ExternalMcpPort}");
 
     externalApp = externalBuilder.Build();