feat(client): standardize connection outcomes (#13)

src/FinalFactory.Rendezvous.Contracts/Http/ConnectionOutcomeContracts.cs

@@ -0,0 +1,33 @@
+using System.Text.Json.Serialization;
+
+namespace FinalFactory.Rendezvous.Contracts;
+
+public sealed class ReportConnectionOutcomeRequest
+{
+    [JsonRequired]
+    public int ContractVersion { get; set; } = ContractLimits.ContractVersion;
+
+    [JsonRequired]
+    public ConnectionOutcomeKind Outcome { get; set; }
+
+    public ConnectionElapsedBucket ElapsedBucket { get; set; }
+
+    [Obsolete("Use ElapsedBucket. Exact elapsed time is accepted only for v1 compatibility and is not retained.")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
+    public int ElapsedMilliseconds { get; set; }
+
+    [Obsolete("Diagnostic codes are accepted only for v1 compatibility and are not retained.")]
+    public string? DiagnosticCode { get; set; }
+}
+
+public sealed class ReportConnectionOutcomeResponse
+{
+    [JsonRequired]
+    public int ContractVersion { get; set; } = ContractLimits.ContractVersion;
+
+    [JsonRequired]
+    public bool Accepted { get; set; }
+
+    [JsonRequired]
+    public bool IsDuplicate { get; set; }
+}

src/FinalFactory.Rendezvous.Contracts/Http/JoinContracts.cs

@@ -76,26 +76,3 @@ public sealed class BrowseHostJoinAttemptsResponse
 
     public string? NextCursor { get; set; }
 }
-
-public sealed class ReportConnectionOutcomeRequest
-{
-    [JsonRequired]
-    public int ContractVersion { get; set; } = ContractLimits.ContractVersion;
-
-    [JsonRequired]
-    public ConnectionOutcomeKind Outcome { get; set; }
-
-    [JsonRequired]
-    public int ElapsedMilliseconds { get; set; }
-
-    public string? DiagnosticCode { get; set; }
-}
-
-public sealed class ReportConnectionOutcomeResponse
-{
-    [JsonRequired]
-    public int ContractVersion { get; set; } = ContractLimits.ContractVersion;
-
-    [JsonRequired]
-    public bool Accepted { get; set; }
-}

src/FinalFactory.Rendezvous.Contracts/Http/SessionContracts.cs

@@ -39,6 +39,8 @@ public sealed class SessionListing
 
     [JsonRequired]
     public Dictionary<string, string> Metadata { get; set; } = new(StringComparer.Ordinal);
+
+    public NetworkEndpoint? DedicatedFallback { get; set; }
 }
 
 public sealed class RegisterSessionRequest
@@ -75,6 +77,8 @@ public sealed class RegisterSessionRequest
 
     [JsonRequired]
     public Dictionary<string, string> Metadata { get; set; } = new(StringComparer.Ordinal);
+
+    public NetworkEndpoint? DedicatedFallback { get; set; }
 }
 
 public sealed class RegisterSessionResponse
@@ -147,6 +151,8 @@ public sealed class UpdateSessionRequest
 
     [JsonRequired]
     public Dictionary<string, string> Metadata { get; set; } = new(StringComparer.Ordinal);
+
+    public NetworkEndpoint? DedicatedFallback { get; set; }
 }
 
 public sealed class DeleteSessionRequest