[Gudge (MGudgin)]

This PR deletes tests/playground, the Electron app for trying MXC policies interactively. Since #1355 it has called Node SDK entry points that no longer exist: the now-empty @microsoft/mxc-sdk root export (getPlatformSupport), spawnSandbox, createConfigFromPolicy, the pre-namespace policy getters and spawnSandboxFromConfig. No pipeline builds it, so the breakage went unnoticed. Porting it to v1 would also mean redesigning its raw-config and "Advanced" modes, because v1 accepts only a typed ContainerRequest, not a raw versioned ContainerConfig.

Details

• Delete all 13 tracked Playground files, including its npm lockfile.
• Drop the Playground lockfile from the lockfile list in CONTRIBUTING.md.

🔗 References

• Move contract-mapped v1 SDK types into V1 namespaces #1355 moved the contract-mapped APIs into the v1 namespace, leaving the Playground's calls dangling.
• Related cleanup: Remove the unused Node subprocess spawn helper #1547 removes the orphaned Node helper.ts and stale spawnSandboxFromConfig docs.

Tests

• git grep -i playground returned no matches after the change.
• No build or test inputs reference tests/playground; no pipeline, workflow or script change was needed.

Microsoft Reviewers: Open in CodeFlow

[azure-pipelines]

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[Copilot]

🟢 Approval recommended

The retirement is self-contained, with no identified blocking defects or impact on supported SDKs and CI inputs.

No open issues 🎉

What changed in this PR

Removes the obsolete Electron Playground without changing supported MXC SDKs or backend behavior.

Changes:

• Deletes the Playground application, build configuration, and supporting documentation.
• Removes its lockfile entry from contributor guidance.

File	Description
tests/​playground/​tsconfig.renderer.json	Removes renderer compiler configuration.
tests/​playground/​tsconfig.main.json	Removes main-process compiler configuration.
tests/​playground/​test-scripts/​winhttp-proxy-test.ps1	Removes Playground proxy test script.
tests/​playground/​src/​renderer/​styles.css	Removes application styles.
tests/​playground/​src/​renderer/​index.html	Removes application interface.
tests/​playground/​src/​renderer/​app.ts	Removes interactive scenarios and controls.
tests/​playground/​src/​main/​preload.ts	Removes renderer communication bridge.
tests/​playground/​src/​main/​main.ts	Removes Electron startup and SDK integration.
tests/​playground/​playground-limitations.md	Removes obsolete compatibility documentation.
tests/​playground/​package.json	Removes application dependencies and packaging configuration.
tests/​playground/​build-renderer.js	Removes static asset build script.
tests/​playground/​.gitignore	Removes application-specific ignore rules.
CONTRIBUTING.md	Removes the Playground lockfile listing.

_{Review effort: Balanced}