sln build fix (again), tests fixes, audit work and doctors work

src/__Libraries/StellaOps.Doctor/Models/RemediationStep.cs

@@ -0,0 +1,65 @@
+using System.Collections.Immutable;
+
+namespace StellaOps.Doctor.Models;
+
+/// <summary>
+/// A single step in a remediation workflow.
+/// </summary>
+public sealed record RemediationStep
+{
+    /// <summary>
+    /// Order of this step in the remediation sequence (1-based).
+    /// </summary>
+    public required int Order { get; init; }
+
+    /// <summary>
+    /// Human-readable description of what this step does.
+    /// </summary>
+    public required string Description { get; init; }
+
+    /// <summary>
+    /// The command or action to execute.
+    /// May contain placeholders like {HOSTNAME} or {PASSWORD}.
+    /// </summary>
+    public required string Command { get; init; }
+
+    /// <summary>
+    /// Type of command (shell, SQL, API, etc.).
+    /// </summary>
+    public CommandType CommandType { get; init; } = CommandType.Shell;
+
+    /// <summary>
+    /// Placeholders in the command that need user-supplied values.
+    /// Key is the placeholder name (e.g., "HOSTNAME"), value is the description.
+    /// </summary>
+    public IReadOnlyDictionary<string, string>? Placeholders { get; init; }
+}
+
+/// <summary>
+/// Remediation instructions for fixing a failed check.
+/// </summary>
+public sealed record Remediation
+{
+    /// <summary>
+    /// Ordered steps to remediate the issue.
+    /// </summary>
+    public required IReadOnlyList<RemediationStep> Steps { get; init; }
+
+    /// <summary>
+    /// Safety note about the remediation (e.g., "This will restart the service").
+    /// </summary>
+    public string? SafetyNote { get; init; }
+
+    /// <summary>
+    /// Whether a backup is recommended before applying remediation.
+    /// </summary>
+    public bool RequiresBackup { get; init; }
+
+    /// <summary>
+    /// Creates an empty remediation with no steps.
+    /// </summary>
+    public static Remediation Empty => new()
+    {
+        Steps = ImmutableArray<RemediationStep>.Empty
+    };
+}