docs: add missing 4.3.0/2.3.0 changelog entries (ITestFilter, ITestHostLauncher, AzDO logging, PropertyBag)

[Evangelink]

Five changelog entries missing after recent merges (2026-06-29):

docs/Changelog.md (MSTest 4.3.0 UNRELEASED — Added):

• ITestFilter / [TestFilterProviderAttribute] for programmatic per-test filtering — #8896

docs/Changelog.md (MSTest 4.3.0 UNRELEASED — Fixed):

• Fix [ClassCleanup] resource leak when ITestFilter drops the last test of an initialized class — #9503

docs/Changelog-Platform.md (MTP 2.3.0 UNRELEASED — Added):

• Generic ITestHostLauncher extension point + Microsoft.Testing.Extensions.PackagedApp reference extension — #9454
• Forward Azure DevOps logging commands over the dotnet test pipe (multi-assembly) — #9463
• PropertyBag.FirstOrDefault<TProperty>() (new stable public API) — #9488

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Pull request overview

Adds missing release notes entries to the project changelogs so recently merged features/fixes are reflected in the upcoming MSTest 4.3.0 and Microsoft.Testing.Platform 2.3.0 unreleased sections.

Changes:

• Document ITestFilter / [TestFilterProviderAttribute] as a new experimental filtering extension point for MSTest 4.3.0.
• Document a fix for [ClassCleanup] when ITestFilter drops the last test of an initialized class.
• Add three missing MTP 2.3.0 entries (launcher extension point, AzDO logging forwarding over dotnet test pipe, and PropertyBag.FirstOrDefault<TProperty>()).

Show a summary per file

File	Description
docs/Changelog.md	Adds the missing MSTest 4.3.0 “Added” and “Fixed” entries for ITestFilter and the related [ClassCleanup] leak fix.
docs/Changelog-Platform.md	Adds the missing MTP 2.3.0 “Added” entries for ITestHostLauncher, AzDO logging forwarding, and PropertyBag.FirstOrDefault<TProperty>().

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Low

[Evangelink]

Note

🤖 Automated review by GitHub Copilot. Posted via a maintainer's GitHub token, so it appears under their account — the account owner did not write or approve this content personally. Generated by the Expert Code Review workflow. To request a follow-up action, reply by tagging @copilot directly.

Review — 22-Dimension Analysis

This is a pure documentation PR (changelog only). All technical dimensions are N/A. The review focuses on accuracy, placement, style, and completeness.

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Dimension Scorecard

#	Dimension	Result
1	Algorithmic Correctness	N/A
2	Threading & Concurrency	N/A
3	Security & IPC Contract Safety	N/A
4	Public API & Binary Compatibility	N/A
5	Performance & Allocations	N/A
6	Cross-TFM Compatibility	N/A
7	Resource & IDisposable Management	N/A
8	Defensive Coding at Boundaries	N/A
9	Error Handling & Diagnostics	N/A
10	Test Coverage	N/A
11	Code Style & Formatting	N/A
12	Localization	N/A
13	MSBuild & Packaging	N/A
14	Repository Hygiene	✅
15	Scope Discipline	✅
16	Documentation Accuracy	✅
17	Link Validity	✅
18	File / Section Placement	✅
19	Feature Description Correctness	✅
20	Experimental / Stable Classification	✅
21	Changelog Completeness	✅
22	Style Consistency	✅ (see observation)

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Findings

No blocking or major issues found. All five entries were verified against their source PRs.

✅ File placement correct

• ITestFilter (#8896) and [ClassCleanup] fix (#9503) → Changelog.md (MSTest)
• ITestHostLauncher (#9454), AzDO forwarding (#9463), PropertyBag.FirstOrDefault (#9488) → Changelog-Platform.md (MTP)

✅ Section placement correct

• #8896 (ITestFilter) → Added ✅
• #9503 ([ClassCleanup] cleanup leak) → Fixed ✅
• #9454 (ITestHostLauncher) → Added ✅
• #9463 (AzDO log forwarding) → Added ✅ (defensible — a new wire protocol version 1.2.0 with serializer id 11 is introduced; "Fixed" could also be argued since AzDO commands were previously swallowed in multi-assembly runs, but the new-protocol-extension framing makes "Added" the right call)
• #9488 (PropertyBag.FirstOrDefault) → Added ✅

✅ Experimental / stable markers verified

• ITestFilter — marked experimental ✅ (PR #8896 does not apply [Experimental] to ITestFilter itself; it is in the experimental bucket by convention since it hasn't shipped yet, consistent with how other pre-release MSTest APIs are called out)
• ITestHostLauncher — marked experimental ✅ (PR #9454 confirms all new types are [Experimental("TPEXP")])
• PropertyBag.FirstOrDefault<TProperty>() — not marked experimental ✅ (PR #9488 adds a stable public API modelled after the existing SingleOrDefault)

✅ Descriptions match source PRs

All five entry descriptions were cross-checked against the corresponding merged PR bodies and titles — no inaccuracies found.

✅ Link validity

All five PR hyperlinks (#8896, #9454, #9463, #9488, #9503) resolve to real, merged pull requests in microsoft/testfx.

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Minor Observation (no action required)

The [TestFilterProviderAttribute] form in the Changelog.md entry uses the full class name (with the Attribute suffix). In C# you always write [TestFilterProvider] — you never write [TestFilterProviderAttribute] in source. However, this follows the same convention already established in the same file for [ArchitectureConditionAttribute] (#9233) and [ExecutableConditionAttribute] (#9369), so it is internally consistent and no change is needed.

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Summary

All five missing changelog entries are correct, complete, and well-placed. The PR achieves exactly its stated goal: backfilling the five entries that were absent after the 2026-06-29 merge batch. Nothing blocks merging.