Update @github/copilot to 1.0.21 (#1039)

* Update @github/copilot to 1.0.21

- Updated nodejs and test harness dependencies
- Re-ran code generators
- Formatted generated code

* Update tests and docs: compaction.compact → history.compact

Agent-Logs-Url: https://github.com/github/copilot-sdk/sessions/3afab108-c1a1-4942-9bce-f4c96ce1936a

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

* Fix tests and docs for compaction → history RPC rename in @github/copilot 1.0.21

Agent-Logs-Url: https://github.com/github/copilot-sdk/sessions/3afab108-c1a1-4942-9bce-f4c96ce1936a

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

* Add missing doc entries for fork/truncate, revert go/samples changes

Agent-Logs-Url: https://github.com/github/copilot-sdk/sessions/2078ab96-88a2-4213-bd0a-a40e7b755bc3

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

Author: 3 people

docs/troubleshooting/compatibility.md

@@ -86,7 +86,9 @@ The Copilot SDK communicates with the CLI via JSON-RPC protocol. Features must b
 | **Experimental** | | |
 | Agent management | `session.rpc.agent.*` | List, select, deselect, get current agent |
 | Fleet mode | `session.rpc.fleet.start()` | Parallel sub-agent execution |
-| Manual compaction | `session.rpc.compaction.compact()` | Trigger compaction on demand |
+| Manual compaction | `session.rpc.history.compact()` | Trigger compaction on demand |
+| History truncation | `session.rpc.history.truncate()` | Remove events from a point onward |
+| Session forking | `server.rpc.sessions.fork()` | Fork a session at a point in history |
 
 ### ❌ Not Available in SDK (CLI-Only)
 
@@ -222,7 +224,7 @@ const session = await client.createSession({
 });
 
 // Manual compaction (experimental)
-const result = await session.rpc.compaction.compact();
+const result = await session.rpc.history.compact();
 console.log(`Removed ${result.tokensRemoved} tokens, ${result.messagesRemoved} messages`);
 ```
 

dotnet/src/Generated/Rpc.cs

@@ -135,7 +135,7 @@ public async Task Should_Compact_Session_History_After_Messages()
         await session.SendAndWaitAsync(new MessageOptions { Prompt = "What is 2+2?" });
 
         // Compact the session
-        var result = await session.Rpc.Compaction.CompactAsync();
+        var result = await session.Rpc.History.CompactAsync();
         Assert.NotNull(result);
     }
 }

dotnet/src/Generated/SessionEvents.cs

@@ -211,7 +211,7 @@ public async Task Should_Succeed_With_Compaction_While_Using_SessionFs()
             var contentBefore = await ReadAllTextSharedAsync(eventsPath);
             Assert.DoesNotContain("checkpointNumber", contentBefore);
 
-            await session.Rpc.Compaction.CompactAsync();
+            await session.Rpc.History.CompactAsync();
             await WaitForConditionAsync(() => compactionEvent is not null, TimeSpan.FromSeconds(30));
             Assert.True(compactionEvent!.Data.Success);
 

dotnet/test/AgentAndCompactRpcTests.cs

@@ -281,7 +281,7 @@ func TestSessionCompactionRpc(t *testing.T) {
 		}
 
 		// Compact the session
-		result, err := session.RPC.Compaction.Compact(t.Context())
+		result, err := session.RPC.History.Compact(t.Context())
 		if err != nil {
 			t.Fatalf("Failed to compact session: %v", err)
 		}