docs(sandbox): include Sprites in provider enumerations

[kylemclaren]

🎯 Changes

The Sprites provider (added in #868) was documented in providers.md but omitted from the provider lists in the overview, quick-start, harnesses, and tools pages. List it alongside Daytona/Vercel where the provider set is enumerated. The sandbox-web example picker prose is left unchanged (that example wires docker/local/vercel/daytona only).

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm run test:pr.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

Summary by CodeRabbit

• Documentation
  • Updated sandbox docs to include Sprites across provider and runtime guidance.
  • Added Sprites to navigation and “where to go next” references.
  • Clarified that Sprites is available alongside existing options like local, Docker, Daytona, and Vercel.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3a78748c-dc1c-4df9-aa00-7e00044f40f8

📥 Commits

Reviewing files that changed from the base of the PR and between c3bb4b9 and 52a3a13.

📒 Files selected for processing (4)

• docs/sandbox/harnesses.md
• docs/sandbox/overview.md
• docs/sandbox/quick-start.md
• docs/sandbox/tools.md

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📝 Walkthrough

Walkthrough

Documentation across four sandbox-related markdown files (harnesses.md, overview.md, quick-start.md, tools.md) was updated to add "Sprites" to existing lists of supported sandbox providers/runtimes, alongside local process, Docker, Daytona, and Vercel.

Changes

Sprites provider mentions

Layer / File(s)	Summary
Add Sprites to provider lists docs/sandbox/overview.md, docs/sandbox/harnesses.md, docs/sandbox/quick-start.md, docs/sandbox/tools.md	Each file's provider/runtime enumeration is expanded to include Sprites alongside existing options.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change by noting Sprites was added to sandbox provider enumerations.
Description check	✅ Passed	The description follows the required template and includes the changes, checklist, and release impact sections.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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