[api] Add idempotent early-exit to setupSandboxHandler

[sweetmantech]

Summary

Make POST /api/sandboxes/setup idempotent by checking if the account already has a valid sandbox before triggering the background task.

Changes

• New: lib/sandbox/isSandboxProvisioned.ts — checks snapshot_id + github_repo + expires_at > now()
• Edit: lib/sandbox/setupSandboxHandler.ts — early-exit when already provisioned
• New: lib/sandbox/__tests__/isSandboxProvisioned.test.ts (5 tests)
• Edit: lib/sandbox/__tests__/setupSandboxHandler.test.ts (4 tests, +1 new)

Linear

MYC-4417

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Project	Deployment	Actions	Updated (UTC)
recoup-api	Ready	Preview	Mar 5, 2026 4:55pm

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⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: b157130b-7373-49e6-aeca-e6245ca23c99

📥 Commits

Reviewing files that changed from the base of the PR and between 687f410 and 16cbb8d.

⛔ Files ignored due to path filters (2)

• lib/sandbox/__tests__/isSandboxProvisioned.test.ts is excluded by !**/*.test.*, !**/__tests__/** and included by lib/**
• lib/sandbox/__tests__/setupSandboxHandler.test.ts is excluded by !**/*.test.*, !**/__tests__/** and included by lib/**

📒 Files selected for processing (2)

• lib/sandbox/isSandboxProvisioned.ts
• lib/sandbox/setupSandboxHandler.ts

✨ 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-4417-api-add-idempotent-early-exit-to-setupsandboxhandler

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