feat: add presence-gated session leases (#7)

Closes #7

tests/FinalFactory.Rendezvous.Tests/State/EphemeralStateTestData.cs

@@ -5,7 +5,10 @@ namespace FinalFactory.Rendezvous.Tests.State;
 
 internal sealed class ManualRendezvousClock : IWallClock, IMonotonicClock
 {
-    public DateTimeOffset UtcNow { get; private set; } = new(2026, 7, 16, 0, 0, 0, TimeSpan.Zero);
+    public ManualRendezvousClock(DateTimeOffset? utcNow = null) =>
+        UtcNow = utcNow ?? new DateTimeOffset(2026, 7, 16, 0, 0, 0, TimeSpan.Zero);
+
+    public DateTimeOffset UtcNow { get; private set; }
     public TimeSpan Elapsed { get; private set; }
 
     public void Advance(TimeSpan duration)
@@ -58,6 +61,7 @@ internal sealed class EphemeralStateFixture
                 LeaseFingerprint = Fingerprint($"lease-{sequence}"),
                 HostPresenceHandle = NewHandle(),
                 HostPresenceFingerprint = Fingerprint($"presence-{sequence}"),
+                CapabilityDerivationSalt = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
             });
     }
 

tests/FinalFactory.Rendezvous.Tests/State/InMemoryEphemeralRendezvousStoreTests.cs

@@ -5,6 +5,16 @@ namespace FinalFactory.Rendezvous.Tests.State;
 
 public sealed class InMemoryEphemeralRendezvousStoreTests
 {
+    [Fact]
+    public void IdempotencyRetentionMustCoverResourceLifetimes()
+    {
+        ManualRendezvousClock clock = new();
+        Assert.Throws<ArgumentOutOfRangeException>(() => new InMemoryEphemeralRendezvousStore(
+            new EphemeralStoreOptions { IdempotencyLifetime = TimeSpan.FromSeconds(5) },
+            clock,
+            clock));
+    }
+
     [Fact]
     public void DuplicateRegistrationIsIdempotentButChangedRequestConflicts()
     {
@@ -49,6 +59,7 @@ public sealed class InMemoryEphemeralRendezvousStoreTests
             listing.Definition.ListingId,
             listing.Definition.LeaseId,
             listing.Definition.LeaseFingerprint,
+            listing.Definition.OwnerSubject,
             listing.Version));
         Assert.Equal(new DateTimeOffset(2026, 7, 16, 0, 1, 1, TimeSpan.Zero), renewed.Value!.LeaseExpiresAt);
         fixture.Clock.MoveWall(TimeSpan.FromDays(-60));
@@ -72,6 +83,7 @@ public sealed class InMemoryEphemeralRendezvousStoreTests
                 listing.Definition.ListingId,
                 listing.Definition.LeaseId,
                 listing.Definition.LeaseFingerprint,
+                listing.Definition.OwnerSubject,
                 listing.Version));
         });
         Task<StoreResult<bool>> delete = Task.Run(() =>
@@ -80,7 +92,8 @@ public sealed class InMemoryEphemeralRendezvousStoreTests
             return fixture.Store.DeleteListing(new(
                 command.Listing.ListingId,
                 command.Listing.LeaseId,
-                command.Listing.LeaseFingerprint));
+                command.Listing.LeaseFingerprint,
+                command.Listing.OwnerSubject));
         });
 
         start.Set();
@@ -102,6 +115,7 @@ public sealed class InMemoryEphemeralRendezvousStoreTests
             listing.Definition.ListingId,
             listing.Definition.LeaseId,
             listing.Definition.LeaseFingerprint,
+            listing.Definition.OwnerSubject,
             listing.Version);
 
         StoreResult<StoredListing> first = fixture.Store.RenewLease(command);