fix: revert compaction snapshot and skip compaction tests for all languages

Restore main's compaction snapshot and skip the compaction tests
across all 4 SDKs (Node.js, Python, Go, .NET) until they are
stabilized.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: SteveSandersonMS

dotnet/test/CompactionTests.cs

@@ -11,7 +11,7 @@ namespace GitHub.Copilot.SDK.Test;
 
 public class CompactionTests(E2ETestFixture fixture, ITestOutputHelper output) : E2ETestBase(fixture, "compaction", output)
 {
-    [Fact]
+    [Fact(Skip = "Compaction tests are skipped due to flakiness — re-enable once stabilized")]
     public async Task Should_Trigger_Compaction_With_Low_Threshold_And_Emit_Events()
     {
         // Create session with very low compaction thresholds to trigger compaction quickly
@@ -81,7 +81,7 @@ await session.SendAndWaitAsync(new MessageOptions
         Assert.Contains("dragon", answer.Data.Content.ToLower());
     }
 
-    [Fact]
+    [Fact(Skip = "Compaction tests are skipped due to flakiness — re-enable once stabilized")]
     public async Task Should_Not_Emit_Compaction_Events_When_Infinite_Sessions_Disabled()
     {
         var session = await CreateSessionAsync(new SessionConfig

go/internal/e2e/compaction_test.go

@@ -9,6 +9,7 @@ import (
 )
 
 func TestCompaction(t *testing.T) {
+	t.Skip("Compaction tests are skipped due to flakiness — re-enable once stabilized")
 	ctx := testharness.NewTestContext(t)
 	client := ctx.NewClient()
 	t.Cleanup(func() { client.ForceStop() })

nodejs/test/e2e/compaction.test.ts

@@ -3,7 +3,7 @@ import { SessionEvent, approveAll } from "../../src/index.js";
 import { createSdkTestContext } from "./harness/sdkTestContext.js";
 
 // TODO: Compaction tests are skipped due to flakiness — re-enable once stabilized
-describe("Compaction", async () => {
+describe.skip("Compaction", async () => {
     const { copilotClient: client } = await createSdkTestContext();
 
     it("should trigger compaction with low threshold and emit events", async () => {

python/e2e/test_compaction.py

@@ -7,7 +7,10 @@
 
 from .testharness import E2ETestContext
 
-pytestmark = pytest.mark.asyncio(loop_scope="module")
+pytestmark = [
+    pytest.mark.asyncio(loop_scope="module"),
+    pytest.mark.skip(reason="Compaction tests are skipped due to flakiness — re-enable once stabilized"),
+]
 
 
 class TestCompaction: