2. Add playground frontend scaffold and early CI

[anish-sahoo]

• react/vite scaffold, embedded asset pipeline, and early frontend ci
• uses a placeholder app until the final composition/e2e pr
• cog-playground stack: 1. Add Go playground server and handlers #3109, 2. Add playground frontend scaffold and early CI #3108, 3. Add core playground types and utilities #3114, 4. Add shared playground UI and JSON editor #3110/5. Add Cog playground API client #3106, 6. Add playground connection feature #3105/7. Add playground input controls and validation #3111/8. Add playground prediction controls and output #3107, 9. Wire up Cog playground and documentation #3113, 10. Compose playground app and add browser e2e #3112

[ask-bonk]

@anish-sahoo Bonk workflow was cancelled.

View workflow run · To retry, trigger Bonk again.

[ask-bonk]

I'm Bonk, and I've done a quick review of your PR.

Summary: Scaffold React/Vite playground frontend with embedded asset pipeline and CI integration.

Issues found:

1. Artifact action version mismatch (Medium): actions/upload-artifact@v6 is used to upload playground assets, but actions/download-artifact@v8 is used to download them. These should be aligned to the same major version to avoid compatibility surprises.
2. Unused change-detection output (Low): The playground-changes job computes a changed output, but no downstream job references needs.playground-changes.outputs.changed. All playground jobs and build-cog run unconditionally regardless, making the change detection dead code for now.

[ask-bonk]

Review posted successfully to PR #3108.

Issues flagged:

1. Artifact action version mismatch — actions/upload-artifact@v6 paired with actions/download-artifact@v8 in both CI and release workflows. Suggested aligning to the same major version.
2. Unused change-detection output — The playground-changes job computes a changed output that no downstream job consumes, making it dead code for now.

github run

[anish-sahoo]

Review disposition:

• Keeping actions/upload-artifact@v6 with actions/download-artifact@v8: the actions are independently versioned, this pairing is already used by the release workflow, and download v8 verifies artifact digests.
• playground-changes.outputs.changed is intentionally introduced in this early CI stage and consumed by final PR 10. Compose playground app and add browser e2e #3112 to gate Playwright.

The inline artifact threads are resolved.

[markphelps]

whats this for?