Update roslyn to 5.13.0-1.26479.11

[dibarbet]

Roslyn build: 20260929.11

View Complete Diff of Changes

• Add XML parsing mode to the Razor markup parser (PR: #85721)
• Update Gladstone and related SDK assemblies (PR: #85748)
• Rationalize the different command lines for RunTests (PR: #83827)
• Support per-client project autoload initialization options (PR: #85814)
• Fix ref safety analysis of mutable non-assignable receivers (PR: #85730)
• Post-snap main configuration for VS 18.13 (PR: #85820)
• Reduce Roslyn editor exception overhead (PR: #85240)
• Add Razor language version 12 (PR: #85720)
• Deduplicate agent documentation maintenance guidance (PR: #85815)
• FileBasedProgramsEntryPointDiscovery: Use File.Move instead of File.Replace for cache file (PR: #85763)
• Support MTP in language server test runs (PR: #85271)
• docs: add general troubleshooting (PR: #84287)
• Skip remaining failing integration tests (PR: #85766)
• Add coverage for StrictIn local home handling (PR: #85758)
• Update dependencies for C# extension test discovery compatibility (PR: #85747)
• Add lsp client name as a common property (PR: #85770)
• Fix inline declaration scope for expression-bodied local functions (PR: #85775)
• Read Razor asset-path metadata from the code document (PR: #85738)
• Snap skill: add arcade subscriptions (PR: #85753)
• Add handling for RefKindExtensions.StrictIn in CodeGenerator.HasHome (PR: #85706)
• Add language server platform and version telemetry (PR: #85735)
• Avoid Enum.HasFlag boxing in the compilers (PR: #85263)
• Fix razor generator/ed files not appearing in solution explorer (PR: #85673)
• Skip failing VB integration tests (PR: #85739)
• Skip "New C#" failing integration tests (PR: #85705)
• Add additional daemon lifetime telemetry metadata (PR: #85687)
• Handle empty diagnostic help links (PR: #85734)
• Fix Razor crash for incomplete render modes (PR: #85693)
• Avoid constructor-time ownership for compiler client mutexes (PR: #85675)
• Special-case nullable walker to understand lock (null) in legacy mode (PR: #85182)
• Cleanup Razor integration tests (PR: #85701)
• Remove OmniSharp external access projects (PR: #85700)
• Route faults through the current telemetry instance (PR: #85273)
• Defer LSP semantic tokens until projects finish loading (PR: #85688)
• Support public pull diagnostics alongside legacy endpoints (PR: #85208)
• Create per-server daemon telemetry sessions (PR: #85155)
• Remove analyze and refinement session support (PR: #85055)
• Unsafe evolution: fix new() constraint handling in declarations (PR: #84888)
• Update to .NET 11 RC1 (PR: #85228)
• Set LanguageServer and BuildHost handles to not be inheritable (PR: #85120)
• Merge Helix test history across retry runs (PR: #85679)
• Use a fixture instead of statically writing global.json to a high part of shared temp directory (PR: #85668)
• Restore the built-in VS SDK .pkgdef generation and migrate to it (PR: #85231)
• Improve IOperation shape for a cast utilizing user-defined conversions (PR: #85262)

[Copilot]

Copilot review overview

🟢 Approval recommended

The version and changelog updates are consistent with the repository’s Roslyn update process.

Review effort: Balanced
Findings: None

What changed in this PR

Updates the bundled Roslyn language server and documents relevant user-facing changes.

Changes:

• Bumps Roslyn to 5.13.0-1.26479.11.
• Adds filtered Roslyn release notes.

File	Description
package.json	Updates the shared Roslyn package version.
CHANGELOG.md	Documents relevant changes from the new Roslyn build.

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