What's Changed

• Revert removal of Video Recorder by Jakub Jareš (@nohwnd) in #15336
• Speed up blame by filtering non-.NET processes from dump collection by Jakub Jareš (@nohwnd) in #15518
• Add README.md to NuGet packages by Jakub Jareš (@nohwnd) in #15550
• Report child process info on connection timeout by Jakub Jareš (@nohwnd) in #15603

Changes to tests and infra

• Brand as 18.6 by Jakub Jareš (@nohwnd) in #15423
• Upgrading code coverage version to 18.5.1, by fhnaseer in #15422
• Updating System.Collections.Immutable to 9.0.11 by MSLukeWest in #15425
• Fix attachVS when used for debugging integration tests by Jakub Jareš (@nohwnd) in #15451
• Replace dotnet.config, with global.json by Jakub Jareš (@nohwnd) in #15449
• Document debugging integration tests with AttachVS by @Copilot in #15452
• Fix stack overflow tests by Jakub Jareš (@nohwnd) in #15461
• Make TestAssets.sln buildable locally by Youssef Fahmy (@Youssef1313) in #15466
• Try filtering out tests by Jakub Jareš (@nohwnd) in #15463
• Build just once when tfms run in parallel by Jakub Jareš (@nohwnd) in #15465
• Review simplify compatibility sources, deduplicate tests by Jakub Jareš (@nohwnd) in #15472
• Cleanup dead TRX code by Youssef Fahmy (@Youssef1313) in #15474
• Update .NET runtimes to 8.0.25, 9.0.14, and 10.0.4 by Jakub Jareš (@nohwnd) in #15481
• Compat matrix checker by Jakub Jareš (@nohwnd) in #15480
• Add trx analysis skill by Jakub Jareš (@nohwnd) in #15486
• Split integration tests to single tfm and multi tfm project by Jakub Jareš (@nohwnd) in #15484
• Update matrix by Jakub Jareš (@nohwnd) in #15477
• Break infinite restore loop in VS by Jakub Jareš (@nohwnd) in #15503
• Use global package cache for build, and local for running integration tests by Jakub Jareš (@nohwnd) in #15500
• Update contributing by Jakub Jareš (@nohwnd) in #15505
• Reduce test wall-clock time by increasing minThreads by Artur Spychaj (@drognanar) in #15502
• Indicator flakiness by Jakub Jareš (@nohwnd) in #15513
• Fix ci build by Jakub Jareš (@nohwnd) in #15515
• Fix thread safety issues by Amaury Levé (@Evangelink) in #15512
• Optimize DotnetSDKSimulation_PostProcessing test (163s → 61s) by Jakub Jareš (@nohwnd) in #15516
• Build isolated test assets for single TFM instead of 7 by Jakub Jareš (@nohwnd) in #15517
• Remove unused dependencies from Library.IntegrationTests by Jakub Jareš (@nohwnd) in #15527
• Remove printing _attachments content to console by Jakub Jareš (@nohwnd) in #15520
• Add Linux/macOS test filtering guide to CONTRIBUTING.md by Jakub Jareš (@nohwnd) in #15521
• Change integration test parallelization from ClassLevel to MethodLevel by Jakub Jareš (@nohwnd) in #15526
• Unify target framework checks with IsNetFrameworkTarget/IsNetTarget by Jakub Jareš (@nohwnd) in #15523
• Add unattended work instructions to copilot-instructions.md by Jakub Jareš (@nohwnd) in #15531
• Reduce code style rule severity from warning to suggestion by Jakub Jareš (@nohwnd) in #15522
• Remove Debug/Release line number branching from tests by Jakub Jareš (@nohwnd) in #15519
• Revise unattended work instructions in copilot-instructions.md by Jakub Jareš (@nohwnd) in #15532
• Improve CompatibilityRowsBuilder error message with diagnostic details by Jakub Jareš (@nohwnd) in #15529
• docs: add git worktree and upstream sync workflow to copilot-instructions.md by Jakub Jareš (@nohwnd) in #15538
• Add VSIX runner to smoke tests by Jakub Jareš (@nohwnd) in #15541
• Remove deprecated WebTest and TMI test methods by Jakub Jareš (@nohwnd) in #15525
• Fix compatibility test failures for legacy vstest.console and MSTest adapter by Jakub Jareš (@nohwnd) in #15534
• Convert TestPlatform.sln to slnx format by Jakub Jareš (@nohwnd) in #15551
• Convert test/TestAssets .sln files to .slnx format by Jakub Jareš (@nohwnd) in #15557
• Enable parallelization for blame data collector tests by Jakub Jareš (@nohwnd) in #15552
• Fix CI failure when GeneratedTestAssets directory doesn't exist by Jakub Jareš (@nohwnd) in #15556
• Set DOTNET_ROOT in test.sh for local Linux usage by Jakub Jareš (@nohwnd) in #15559
• Use MSTest recommended analyzers by Amaury Levé (@Evangelink) in #15539
• Document semicolon handling in RunSettings test parameters by Jakub Jareš (@nohwnd) in #15561
• Enable CA1067 analyzer and fix violations by Jakub Jareš (@nohwnd) in #15560
• Fix HTML logger parallel file collision with atomic file creation by Jakub Jareš (@nohwnd) in #15562
• Deduplicate package extraction between verify-nupkgs and IntegrationTestBuild by Jakub Jareš (@nohwnd) in #15554
• Fix MSTEST0046: use Assert.MatchesRegex instead of StringAssert.Matches by Jakub Jareš (@nohwnd) in #15575
• Attach diagnostic logs to acceptance test runs by Jakub Jareš (@nohwnd) in #15572
• Deprecate EnableShutdownAfterTestRun which is no-op by Youssef Fahmy (@Youssef1313) in #15576
• Skip VideoRecorder test on CI due to access denied errors by Jakub Jareš (@nohwnd) in #15587
• Fix integration test build collision with mutex + EventWaitHandle by Jakub Jareš (@nohwnd) in #15568
• Reduce blame test flakiness: increase hang dump timeout to 10s by Jakub Jareš (@nohwnd) in #15590
• Fix concurrent modification in MetricsCollection by Jakub Jareš (@nohwnd) in #15581
• Fix PassingNoArguments test: disable --diag to preserve help output by Jakub Jareš (@nohwnd) in #15583
• perf: fix dictionary double-lookups, Collection.Contains, and LINQ allocations by Amaury Levé (@Evangelink) in #15533
• Replace VSSDK-sourced DLLs with proper package references by Jakub Jareš (@nohwnd) in #15567
• Add target framework to default TRX file name by Jakub Jareš (@nohwnd) in #15565
• Update post-build template parameters by Jakub Jareš (@nohwnd) in #15591
• Fix path for post-build template and adjust validation by Jakub Jareš (@nohwnd) in #15592
• Add azure-pipelines-official.yml to pipeline files by Jakub Jareš (@nohwnd) in #15594
• Update comment formatting for signing validation by Jakub Jareš (@nohwnd) in #15597
• Fix enable-auto-merge for maestro by Youssef Fahmy (@Youssef1313) in #15595
• Auto-approve maestro PRs by Youssef Fahmy (@Youssef1313) in #15598
• Update enable-auto-merge to squash by Youssef Fahmy (@Youssef1313) in #15602
• Update enable-auto-merge.yml for the correct permissions by Youssef Fahmy (@Youssef1313) in #15606
• Add 365 regression tests for untested bug fixes by Jakub Jareš (@nohwnd) in #15615
• Fix typos and add comments to empty catch blocks by Jakub Jareš (@nohwnd) in #15609
• Fix flaky EventLogCollector test: ensure deterministic event log entries by Jakub Jareš (@nohwnd) in #15607
• Mark PathConverter tests as Windows-only by Jakub Jareš (@nohwnd) in #15617
• Fix HangDumpOnTimeout flakiness and ignore VideoRecorder test by Jakub Jareš (@nohwnd) in #15616
• Add copilot-setup-steps.yml by Jakub Jareš (@nohwnd) in #15604
• Add CreateNoNewWindow RunConfiguration setting by Jakub Jareš (@nohwnd) in #15585
• Add preview packages documentation by Jakub Jareš (@nohwnd) in #15628
• Cleanup filter implementation by Youssef Fahmy (@Youssef1313) in #15629
• Fix SCI binding failure in DTA hosts (rel/18.6) by Jakub Jareš (@nohwnd) in #15722
• Remove DiagnosticSource binding redirect (rel/18.6) by Jakub Jareš (@nohwnd) in #15776

Full Changelog: v18.5.1...v18.6.0