style(runtime): three blank lines before the session interval; DrainLanes is private

SessionResumeInterval had two blank lines before it where members take
three. DrainLanes is used only by the claim pipeline, so it no longer
needs to be internal.

Signed-off-by: James Maes <james@kof22.com>
Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>

src/Qqq.PrintAgent.Windows/AgentRuntime.Authentication.cs

@@ -26,6 +26,7 @@ public sealed partial class AgentRuntime
    private string? _lastAuthorizationNote;
 
 
+
    /// <summary>How long a restored or renewed session is used before it is renewed with the server and its identity checked again.</summary>
    internal static readonly TimeSpan SessionResumeInterval = TimeSpan.FromMinutes(5);
 

src/Qqq.PrintAgent.Windows/AgentRuntime.Pipeline.cs

@@ -18,7 +18,7 @@ public sealed partial class AgentRuntime
    /// How many lanes one wake-up starts. It equals the largest download concurrency the client advertises, so a wave can use
    /// every slot the server may grant; lanes beyond the granted slots wait for one, or stop once the queue is drained.
    /// </summary>
-   internal const int DrainLanes = 16;
+   private const int DrainLanes = 16;
 
    private TaskCompletionSource _pipelineChanged = NewSignal();
    private readonly Dictionary<string, CancellationTokenSource> _activeTransfers = new(StringComparer.Ordinal);