feat(mcp): add save_finding to the external server

src/ClaudeDo.Worker/Program.cs

@@ -5,6 +5,7 @@ using ClaudeDo.Data.Repositories;
 using ClaudeDo.Worker.Agents;
 using ClaudeDo.Worker.Config;
 using ClaudeDo.Worker.External;
+using ClaudeDo.Worker.Findings;
 using ClaudeDo.Worker.Hub;
 using ClaudeDo.Worker.Lifecycle;
 using ClaudeDo.Worker.Logging;
@@ -62,6 +63,8 @@ builder.Services.AddDbContextFactory<ClaudeDoDbContext>(opt =>
 
 builder.Services.AddSingleton(cfg);
 builder.Services.AddSingleton<AttachmentStore>();
+// Singleton so the always-on and in-task MCP servers share the same index write lock.
+builder.Services.AddSingleton<IFindingsStore, FindingsStore>();
 builder.Services.AddHostedService<StaleTaskRecovery>();
 builder.Services.AddHostedService<OrphanRecovery>();
 builder.Services.AddHostedService<AttachmentOrphanRecovery>();
@@ -313,6 +316,9 @@ if (cfg.ExternalMcpPort > 0)
     externalBuilder.Services.AddSingleton(app.Services.GetRequiredService<AttachmentStore>());
     externalBuilder.Services.AddScoped<TaskAttachmentRepository>();
     externalBuilder.Services.AddScoped<AttachmentMcpTools>();
+    externalBuilder.Services.AddSingleton<IFindingsStore>(app.Services.GetRequiredService<IFindingsStore>());
+    externalBuilder.Services.AddScoped<IFindingsStoreLocator, FindingsStoreLocator>();
+    externalBuilder.Services.AddScoped<FindingsMcpTools>();
     externalBuilder.Services.AddMcpServer()
         .WithHttpTransport()
         .WithRequestFilters(f => f.AddCallToolFilter(ExternalMcpExceptionFilter.Wrap))
@@ -327,7 +333,8 @@ if (cfg.ExternalMcpPort > 0)
         .WithTools<AppSettingsMcpTools>()
         .WithTools<TaskWaitMcpTools>()
         .WithTools<QueueStateMcpTools>()
-        .WithTools<AttachmentMcpTools>();
+        .WithTools<AttachmentMcpTools>()
+        .WithTools<FindingsMcpTools>();
     externalBuilder.WebHost.UseUrls($"http://127.0.0.1:{cfg.ExternalMcpPort}");
 
     externalApp = externalBuilder.Build();