Add missing changelog entries for ExecutableConditionAttribute and testconfig.json schema

[Evangelink]

Two user-facing changelog entries were missed when the PRs were merged:

• docs/Changelog.md: Add entry for [ExecutableConditionAttribute] (#9369) in the 4.3.0 UNRELEASED Added section.
• docs/Changelog-Platform.md: Add entry for testconfig.json JSON schema for SchemaStore publication and IDE validation (#9405) in the 2.3.0 UNRELEASED Added section.

Found during adhoc QA pass (2026-06-25).

🤖 Automated content 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 Adhoc QA workflow. · 515.7 AIC · ⌖ 23.5 AIC · ⊞ 51.2K · [◷]( · ◷)

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[Copilot]

Pull request overview

Adds two previously-missed, user-facing changelog entries so the upcoming MSTest (4.3.0) and Microsoft.Testing.Platform (2.3.0) releases correctly document recently merged features.

Changes:

• Add a 4.3.0 (UNRELEASED) “Added” changelog entry for ExecutableConditionAttribute (#9369).
• Add a 2.3.0 (UNRELEASED) “Added” changelog entry for the testconfig.json JSON schema (#9405).

Show a summary per file

File	Description
docs/Changelog.md	Adds missing 4.3.0 UNRELEASED “Added” entry for ExecutableConditionAttribute (#9369).
docs/Changelog-Platform.md	Adds missing 2.3.0 UNRELEASED “Added” entry for testconfig.json JSON schema (#9405).

Copilot's findings

• Files reviewed: 2/2 changed files
• Comments generated: 0

[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.

✅ 22/22 dimensions clean — no findings.

This is a documentation-only PR (two .md changelog files). All code-level dimensions (Correctness, Threading, Security, Public API, Performance, Cross-TFM, Resources, Defensive Coding, Localization, Test Isolation, Assertions, Flakiness, Coverage, Data-Driven, Code Structure, Naming, Analyzers, IPC Wire, Build Infrastructure, PowerShell) are N/A.

Dimension 17 – Documentation Accuracy: Both entries are factually correct:

• [ExecutableConditionAttribute] → Changelog.md (MSTest), 4.3.0 UNRELEASED, ### Added. PR #9369 title and author match.
• testconfig.json JSON schema → Changelog-Platform.md (MTP), 2.3.0 UNRELEASED, ### Added. PR #9405 title and author match. The phrase "and IDE validation" is an accurate editorial addition consistent with the PR description.
• Both entries are appended in ascending PR-number order, consistent with the existing file pattern.

Dimension 21 – Scope & PR Discipline: Single concern, both originating PRs are cross-referenced, no unrelated changes.