Make contract emission safe under rapid successive saves

[jkomyno]

Summary

• reject superseded emit generations so older emits cannot publish after a newer request starts, even if the newer emit later fails
• publish watch-mode contract artifacts through a managed current-generation pointer so contract.json and contract.d.ts become visible as one logical update
• add control-api regressions for stale-generation writes, failed newer requests, and split-artifact visibility during commit steps

Validation

• pnpm --filter @prisma-next/cli exec vitest run test/control-api/contract-emit.test.ts

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🧪 Generate unit tests (beta)

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• Commit unit tests in branch apr-vp3-03-atomic-emit-writes

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commit: c5e478d