[miniflare] Fix dev registry test opt-in

[mikea]

The dev-registry registration default is now opt-in. Add unsafeRegisterWorker: true to the registry-churn test workers, including retained workers on configuration updates.

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• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: this corrects test fixtures for an existing option.

Note

This is a contribution from an AI agent: pi, GPT-5.6 Terra.

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[changeset-bot]

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Latest commit: 513378f

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[workers-devprod]

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[devin-ai-integration]

✅ Devin Review: No Issues Found

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[ask-bonk]

This confirms the context: #15040 "Restrict dev registry registration to user workers" made registration opt-in via unsafeRegisterWorker. The "registry churn" tests were likely added around that time but omitted the flag. This PR is a straightforward, correct test fix.

The change is minimal, correct, follows the existing conventions in the file, and there are no logic bugs, security issues, or behavioral problems. The setOptions calls correctly re-include the flag since options are fully replaced (not merged). Since it only touches test fixtures for an existing option, the lack of a changeset is also appropriate.

LGTM

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commit: 513378f

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