feat: Implement vulnerability token signing and verification utilities

- Added VulnTokenSigner for signing JWT tokens with specified algorithms and keys.
- Introduced VulnTokenUtilities for resolving tenant and subject claims, and sanitizing context dictionaries.
- Created VulnTokenVerificationUtilities for parsing tokens, verifying signatures, and deserializing payloads.
- Developed VulnWorkflowAntiForgeryTokenIssuer for issuing anti-forgery tokens with configurable options.
- Implemented VulnWorkflowAntiForgeryTokenVerifier for verifying anti-forgery tokens and validating payloads.
- Added AuthorityVulnerabilityExplorerOptions to manage configuration for vulnerability explorer features.
- Included tests for FilesystemPackRunDispatcher to ensure proper job handling under egress policy restrictions.

src/__Libraries/StellaOps.Configuration/StellaOpsAuthorityOptions.cs

@@ -99,6 +99,11 @@ public sealed class StellaOpsAuthorityOptions
     /// </summary>
     public AuthorityNotificationsOptions Notifications { get; } = new();
 
+    /// <summary>
+    /// Vulnerability explorer integration configuration (workflow CSRF tokens, attachments).
+    /// </summary>
+    public AuthorityVulnerabilityExplorerOptions VulnerabilityExplorer { get; } = new();
+
     /// <summary>
     /// Exception governance configuration (routing templates, MFA requirements).
     /// </summary>
@@ -158,6 +163,7 @@ public sealed class StellaOpsAuthorityOptions
         AdvisoryAi.Normalize();
         AdvisoryAi.Validate();
         Notifications.Validate();
+        VulnerabilityExplorer.Validate();
         ApiLifecycle.Validate();
         Signing.Validate();
         Delegation.NormalizeAndValidate(tenants);
@@ -772,6 +778,9 @@ public sealed class AuthorityTenantOptions
     public IList<string> DefaultRoles { get; } = new List<string>();
     public IList<string> Projects { get; } = new List<string>();
 
+    public IDictionary<string, AuthorityTenantRoleOptions> Roles { get; } =
+        new Dictionary<string, AuthorityTenantRoleOptions>(StringComparer.OrdinalIgnoreCase);
+
     public AuthorityTenantAdvisoryAiOptions AdvisoryAi { get; } = new();
 
     public AuthorityTenantDelegationOptions Delegation { get; } = new();
@@ -820,6 +829,28 @@ public sealed class AuthorityTenantOptions
 
         AdvisoryAi.Normalize(advisoryAiOptions);
         Delegation.Normalize(delegationOptions);
+
+        if (Roles.Count > 0)
+        {
+            var normalizedRoles = new Dictionary<string, AuthorityTenantRoleOptions>(StringComparer.Ordinal);
+            foreach (var (roleName, roleOptions) in Roles)
+            {
+                if (string.IsNullOrWhiteSpace(roleName) || roleOptions is null)
+                {
+                    continue;
+                }
+
+                var normalizedName = roleName.Trim().ToLowerInvariant();
+                roleOptions.Normalize(normalizedName);
+                normalizedRoles[normalizedName] = roleOptions;
+            }
+
+            Roles.Clear();
+            foreach (var entry in normalizedRoles)
+            {
+                Roles.Add(entry.Key, entry.Value);
+            }
+        }
     }
 
     internal void Validate(AuthorityAdvisoryAiOptions? advisoryAiOptions, AuthorityDelegationOptions delegationOptions)
@@ -852,12 +883,149 @@ public sealed class AuthorityTenantOptions
 
         AdvisoryAi.Validate(advisoryAiOptions);
         Delegation.Validate(delegationOptions, Id);
+
+        if (Roles.Count > 0)
+        {
+            foreach (var (roleName, roleOptions) in Roles)
+            {
+                if (roleOptions is null)
+                {
+                    throw new InvalidOperationException($"Tenant '{Id}' defines role '{roleName}' without configuration.");
+                }
+
+                roleOptions.Validate(Id, roleName);
+            }
+        }
     }
 
     private static readonly Regex TenantSlugRegex = new("^[a-z0-9-]+$", RegexOptions.Compiled | RegexOptions.CultureInvariant);
     private static readonly Regex ProjectSlugRegex = new("^[a-z0-9-]+$", RegexOptions.Compiled | RegexOptions.CultureInvariant);
 }
 
+public sealed class AuthorityTenantRoleOptions
+{
+    public IList<string> Scopes { get; } = new List<string>();
+
+    public IDictionary<string, IList<string>> Attributes { get; } =
+        new Dictionary<string, IList<string>>(StringComparer.OrdinalIgnoreCase);
+
+    internal void Normalize(string roleName)
+    {
+        if (Scopes.Count > 0)
+        {
+            var seenScopes = new HashSet<string>(StringComparer.Ordinal);
+            for (var index = Scopes.Count - 1; index >= 0; index--)
+            {
+                var current = Scopes[index];
+                var normalized = StellaOpsScopes.Normalize(current);
+                if (string.IsNullOrWhiteSpace(normalized))
+                {
+                    Scopes.RemoveAt(index);
+                    continue;
+                }
+
+                if (!seenScopes.Add(normalized))
+                {
+                    Scopes.RemoveAt(index);
+                    continue;
+                }
+
+                Scopes[index] = normalized;
+            }
+        }
+
+        if (Attributes.Count > 0)
+        {
+            var normalizedAttributes = new Dictionary<string, IList<string>>(StringComparer.OrdinalIgnoreCase);
+            foreach (var (attributeName, values) in Attributes)
+            {
+                var normalizedName = attributeName?.Trim();
+                if (string.IsNullOrWhiteSpace(normalizedName))
+                {
+                    continue;
+                }
+
+                normalizedName = normalizedName.ToLowerInvariant();
+
+                var normalizedValues = new List<string>();
+                var seenValues = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
+                var wildcard = false;
+
+                if (values is not null)
+                {
+                    foreach (var value in values)
+                    {
+                        if (string.IsNullOrWhiteSpace(value))
+                        {
+                            continue;
+                        }
+
+                        var trimmed = value.Trim();
+                        if (trimmed.Equals("*", StringComparison.Ordinal))
+                        {
+                            normalizedValues.Clear();
+                            normalizedValues.Add("*");
+                            wildcard = true;
+                            break;
+                        }
+
+                        var lower = trimmed.ToLowerInvariant();
+                        if (seenValues.Add(lower))
+                        {
+                            normalizedValues.Add(lower);
+                        }
+                    }
+                }
+
+                if (wildcard || normalizedValues.Count > 0)
+                {
+                    normalizedAttributes[normalizedName] = normalizedValues;
+                }
+            }
+
+            Attributes.Clear();
+            foreach (var pair in normalizedAttributes)
+            {
+                Attributes[pair.Key] = pair.Value;
+            }
+        }
+    }
+
+    internal void Validate(string tenantId, string roleName)
+    {
+        if (Scopes.Count == 0)
+        {
+            throw new InvalidOperationException($"Tenant '{tenantId}' role '{roleName}' must specify at least one scope.");
+        }
+
+        foreach (var scope in Scopes)
+        {
+            if (!StellaOpsScopes.IsKnown(scope))
+            {
+                throw new InvalidOperationException($"Tenant '{tenantId}' role '{roleName}' references unknown scope '{scope}'.");
+            }
+        }
+
+        if (Attributes.Count > 0)
+        {
+            foreach (var attributeName in Attributes.Keys)
+            {
+                if (!AllowedAttributeKeys.Contains(attributeName))
+                {
+                    throw new InvalidOperationException($"Tenant '{tenantId}' role '{roleName}' defines unsupported attribute '{attributeName}'. Allowed attributes: env, owner, business_tier.");
+                }
+            }
+        }
+    }
+
+    private static readonly HashSet<string> AllowedAttributeKeys = new(new[]
+    {
+        "env",
+        "owner",
+        "business_tier"
+    }, StringComparer.OrdinalIgnoreCase);
+}
+
 public sealed class AuthorityDelegationOptions
 {
     private readonly IList<AuthorityServiceAccountSeedOptions> serviceAccounts = new List<AuthorityServiceAccountSeedOptions>();
@@ -977,6 +1145,9 @@ public sealed class AuthorityServiceAccountSeedOptions
 
     public IList<string> AllowedScopes { get; } = new List<string>();
 
+    public IDictionary<string, IList<string>> Attributes { get; } =
+        new Dictionary<string, IList<string>>(StringComparer.OrdinalIgnoreCase);
+
     internal void Normalize()
     {
         AccountId = (AccountId ?? string.Empty).Trim();
@@ -990,6 +1161,8 @@ public sealed class AuthorityServiceAccountSeedOptions
             var normalized = StellaOpsScopes.Normalize(scope);
             return normalized ?? scope.Trim().ToLowerInvariant();
         }, StringComparer.Ordinal);
+
+        NormalizeAttributes(Attributes);
     }
 
     internal void Validate(ISet<string> tenantIds)
@@ -1018,6 +1191,17 @@ public sealed class AuthorityServiceAccountSeedOptions
         {
             throw new InvalidOperationException($"Service account '{AccountId}' must specify at least one allowed scope.");
         }
+
+        if (Attributes.Count > 0)
+        {
+            foreach (var attributeName in Attributes.Keys)
+            {
+                if (!AllowedAttributeKeys.Contains(attributeName))
+                {
+                    throw new InvalidOperationException($"Service account '{AccountId}' defines unsupported attribute '{attributeName}'. Allowed attributes: env, owner, business_tier.");
+                }
+            }
+        }
     }
 
     private static void NormalizeList(IList<string> values, Func<string, string> normalize, IEqualityComparer<string> comparer)
@@ -1057,6 +1241,74 @@ public sealed class AuthorityServiceAccountSeedOptions
             values[index] = normalized;
         }
     }
+
+    private static void NormalizeAttributes(IDictionary<string, IList<string>> attributes)
+    {
+        ArgumentNullException.ThrowIfNull(attributes);
+
+        if (attributes.Count == 0)
+        {
+            return;
+        }
+
+        var normalized = new Dictionary<string, IList<string>>(StringComparer.OrdinalIgnoreCase);
+        foreach (var (name, values) in attributes)
+        {
+            var key = string.IsNullOrWhiteSpace(name) ? null : name.Trim().ToLowerInvariant();
+            if (string.IsNullOrWhiteSpace(key))
+            {
+                continue;
+            }
+
+            var normalizedValues = new List<string>();
+            var seen = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
+            var wildcard = false;
+
+            if (values is not null)
+            {
+                foreach (var value in values)
+                {
+                    if (string.IsNullOrWhiteSpace(value))
+                    {
+                        continue;
+                    }
+
+                    var trimmed = value.Trim();
+                    if (trimmed.Equals("*", StringComparison.Ordinal))
+                    {
+                        normalizedValues.Clear();
+                        normalizedValues.Add("*");
+                        wildcard = true;
+                        break;
+                    }
+
+                    var lower = trimmed.ToLowerInvariant();
+                    if (seen.Add(lower))
+                    {
+                        normalizedValues.Add(lower);
+                    }
+                }
+            }
+
+            if (wildcard || normalizedValues.Count > 0)
+            {
+                normalized[key] = normalizedValues;
+            }
+        }
+
+        attributes.Clear();
+        foreach (var pair in normalized)
+        {
+            attributes[pair.Key] = pair.Value;
+        }
+    }
+
+    private static readonly HashSet<string> AllowedAttributeKeys = new(new[]
+    {
+        "env",
+        "owner",
+        "business_tier"
+    }, StringComparer.OrdinalIgnoreCase);
 }