fix(mcp): register ticket import tools in the external MCP container

The external MCP server has its own DI container; TicketMcpTools could not
resolve TicketImportService there, so both tools failed at runtime. Also
surface a skipped import in the prime outcome and treat a sweep where every
project board fails as an error instead of an empty backlog.

src/ClaudeDo.Worker/Program.cs

@@ -367,6 +367,7 @@ if (cfg.ExternalMcpPort > 0)
     Share<FindingsStore>();
     Share<HandoffRoundTracker>();
     Share<HandlerUsageGuard>();
+    Share<TicketImportService>();
 
     externalBuilder.Services.AddScoped<ClaudeDoDbContext>(sp =>
         sp.GetRequiredService<IDbContextFactory<ClaudeDoDbContext>>().CreateDbContext());
@@ -395,6 +396,7 @@ if (cfg.ExternalMcpPort > 0)
     externalBuilder.Services.AddScoped<DailyNoteRepository>();
     externalBuilder.Services.AddScoped<FindingsMcpTools>();
     externalBuilder.Services.AddScoped<NotesMcpTools>();
+    externalBuilder.Services.AddScoped<TicketMcpTools>();
     externalBuilder.Services.AddMcpServer()
         .WithHttpTransport(o => o.Stateless = true)
         .WithRequestFilters(f => f