Update Copilot CLI to 1.0.87-0 (#2731)

* Repair codegen for Copilot CLI 1.0.87 schemas

Disambiguate shared C# session request envelopes without weakening collision checks. Preserve Rust explicit unknown values and forward-compatible fallbacks from #2703. Resolve Go event payload references and preserve root event unions across bindings, with real envelope regressions and target-schema Java test adaptations.

Validated with the 1.0.87-0 generated overlay; release pins and generated outputs are intentionally excluded from this source-only workflow seed.

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

* Update Copilot CLI to 1.0.87-0

- Updated the shared CLI release pin
- Re-ran code generators
- Formatted generated code

* Fix CLI 1.0.87 replay fixtures and Java test formatting

Preserve existing subagent histories and add only observed short-idle, full-history read variants with failure/cancellation rejection coverage. Apply the repository root Java formatter to the two repaired test files.

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

* Fix Java shared RPC variant ownership

Preserve historical public variant superclasses and emit contextual
secondary-root variants with validated Jackson subtype registrations.

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

* Cover new Java RPC wrapper dispatch methods

Exercise 29 new public endpoints and optional marketplace refresh with
independent method, result type, payload, and session identity assertions.

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

* Fix Windows bundled CLI tar extractor availability

Compile the private TAR helper only for non-Windows production or bundled
unit tests, preserving Windows runtime-archive test coverage.

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

* fix(rust): preserve constant constraints on referenced fields

Validate field-local literals before decoding extensible named enums so
untagged catalogue candidates cannot consume another kind. Preserve public
field types and standalone Unknown fallbacks; regenerate from CLI 1.0.87-0.

Includes the exact AI-skill decoding regression and MCP/Plugin controls.

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

---------

Co-authored-by: Hunter Sadler <aurokin@github.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: 3 people

dotnet/src/Generated/Rpc.cs

@@ -3,12 +3,78 @@
  *--------------------------------------------------------------------------------------------*/
 
 using System.Text.Json;
+using System.Text.Json.Nodes;
 using Xunit;
 
 namespace GitHub.Copilot.Test.Unit;
 
 public class SessionEventSerializationTests
 {
+    [Theory]
+    [InlineData("session.idle", "{}")]
+    [InlineData("user.message", """{"content":"hello"}""")]
+    public void ObjectEvent_PreservesCompleteEnvelope(string eventType, string data)
+    {
+        var wire = $$"""
+            {
+                "id":"11111111-1111-1111-1111-111111111111",
+                "timestamp":"2026-09-18T22:00:00+00:00",
+                "parentId":"22222222-2222-2222-2222-222222222222",
+                "type":"{{eventType}}",
+                "data":{{data}}
+            }
+            """;
+        var decoded = SessionEvent.FromJson(wire);
+        Assert.Equal(eventType, decoded.Type);
+        Assert.True(JsonNode.DeepEquals(JsonNode.Parse(wire), JsonNode.Parse(decoded.ToJson())));
+    }
+
+    [Theory]
+    [InlineData("session.indexed_search", "status", """{"state":"ready"}""")]
+    [InlineData("session.indexed_search", "startup", """{"outcome":"started","startupDurationMs":1.5,"forcedByEnv":false,"warmStart":false,"fileCount":0,"eligible":false,"errorMessage":"diagnostic"}""")]
+    [InlineData("session.indexed_search", "server_error", """{"errorType":"unexpected_exit","exitCode":0,"errorMessage":"diagnostic"}""")]
+    [InlineData("session.indexed_search", "incremental", """{"phase":"updated","changedFileCount":0,"addedFileCount":1,"deletedFileCount":0,"totalChangeCount":1,"walkDurationMs":0.5,"updateDurationMs":1.25,"totalDurationMs":1.75}""")]
+    [InlineData("sandbox.decision", "policy_resolved", """{"backend":"seatbelt","policySource":"default_policy","readwritePathsCount":0,"readonlyPathsCount":1,"deniedPathsCount":0,"addCurrentWorkingDirectory":false,"allowOutbound":false,"allowLocalNetwork":false,"proxyMode":"none","allowBypass":false,"gitAuth":false,"ghAuth":false,"keychainAccess":false}""")]
+    [InlineData("sandbox.decision", "spawn_completed", """{"backend":"seatbelt","durationMs":1.5}""")]
+    [InlineData("sandbox.decision", "enforcement_state", """{"backend":"seatbelt","command":"echo test","attestation":"spawn_succeeded"}""")]
+    [InlineData("sandbox.decision", "access_denied", """{"denialClass":"filesystem_read","attestation":"builtin_policy_checked","deniedResource":"/example","command":"cat example"}""")]
+    [InlineData("sandbox.decision", "bypass_decided", """{"source":"user_prompted","deniedResource":"/example"}""")]
+    [InlineData("sandbox.decision", "permissive_retry_decided", """{"source":"model_requested","command":"echo test"}""")]
+    [InlineData("sandbox.decision", "permissive_retry_completed", """{"processName":"example","command":"echo test"}""")]
+    public void UnionEvent_PreservesCompleteEnvelope(string eventType, string kind, string fields)
+    {
+        var data = eventType == "sandbox.decision"
+            ? JsonNode.Parse("""{"control":"process","outcome":"resolved","platform":"macos","enforcementPoint":"shell","toolCallId":"tool-1"}""")!.AsObject()
+            : new JsonObject();
+        data["kind"] = kind;
+        foreach (var field in JsonNode.Parse(fields)!.AsObject())
+        {
+            data[field.Key] = field.Value?.DeepClone();
+        }
+        var envelope = new JsonObject
+        {
+            ["id"] = "11111111-1111-1111-1111-111111111111",
+            ["timestamp"] = "2026-09-18T22:00:00+00:00",
+            ["parentId"] = "22222222-2222-2222-2222-222222222222",
+            ["ephemeral"] = true,
+            ["agentId"] = "agent-1",
+            ["type"] = eventType,
+            ["data"] = data,
+        };
+
+        var decoded = SessionEvent.FromJson(envelope.ToJsonString());
+        Assert.Equal(eventType, decoded.Type);
+        if (eventType == "session.indexed_search")
+        {
+            Assert.IsType<SessionIndexedSearchEvent>(decoded);
+        }
+        else
+        {
+            Assert.IsType<SandboxDecisionEvent>(decoded);
+        }
+        Assert.True(JsonNode.DeepEquals(envelope, JsonNode.Parse(decoded.ToJson())));
+    }
+
     public static TheoryData<AutoTier?, string?> AutoTiers => new()
     {
         { AutoTier.Efficiency, "efficiency" },