refactor: simplify POST /api/sandboxes to only create sandbox

[sweetmantech]

Summary

• Remove prompt execution from the createSandbox endpoint for faster API response
• Sandbox is now created and left running so commands can be executed separately via the runSandboxCommand task
• Simplify validateSandboxBody to only validate authentication (no prompt required)

Test plan

• All existing sandbox tests pass (39 tests)
• New test added to verify createSandbox is called without arguments
• New test added to verify sandbox is not stopped after creation

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
recoup-api	Ready	Preview	Feb 2, 2026 10:30pm

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch sweetmantech/myc-4100-api-call-runsandboxcommand-task-for-faster-api-response

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