Unskip getSessionMetadata E2E tests (CLI 1.0.12-0 adds support)

Now that the runtime includes session.getMetadata, enable the
previously-skipped Node.js and .NET E2E tests. Both tests are updated
to send a message and wait before querying metadata, matching the
pattern used in the already-running Python and Go tests (session files
aren't persisted until at least one exchange completes).

Author: MackinnonBuck

dotnet/test/SessionTests.cs

@@ -407,12 +407,15 @@ public async Task Should_List_Sessions_With_Context()
         }
     }
 
-    // TODO: Re-enable once test harness CAPI proxy supports this test's session lifecycle
-    [Fact(Skip = "Needs test harness CAPI proxy support")]
+    [Fact]
     public async Task Should_Get_Session_Metadata_By_Id()
     {
         var session = await CreateSessionAsync();
 
+        // Send a message to persist the session to disk
+        await session.SendAndWaitAsync(new MessageOptions { Prompt = "Say hello" });
+        await Task.Delay(200);
+
         var metadata = await Client.GetSessionMetadataAsync(session.SessionId);
         Assert.NotNull(metadata);
         Assert.Equal(session.SessionId, metadata.SessionId);

nodejs/test/e2e/session.test.ts

@@ -49,11 +49,14 @@ describe("Sessions", async () => {
         }
     });
 
-    // TODO: Re-enable once test harness CAPI proxy supports this test's session lifecycle
-    it.skip("should get session metadata by ID", { timeout: 60000 }, async () => {
+    it("should get session metadata by ID", { timeout: 60000 }, async () => {
         const session = await client.createSession({ onPermissionRequest: approveAll });
         expect(session.sessionId).toMatch(/^[a-f0-9-]+$/);
 
+        // Send a message to persist the session to disk
+        await session.sendAndWait({ prompt: "Say hello" });
+        await new Promise((r) => setTimeout(r, 200));
+
         // Get metadata for the session we just created
         const metadata = await client.getSessionMetadata(session.sessionId);