[miniflare] Support prerelease versioning

[edmundhung]

Adds an opt-in Miniflare prerelease version override using workers-sdk.npmPrereleaseVersion.

When configured, the Changesets version workflow replaces Miniflare's calculated version with the configured prerelease and increments its final counter for major, minor, and patch changesets. Stable dependents continue receiving their normal releases and package Miniflare's exact prerelease through workspace:*. Publishing remains unchanged.

This also permits Miniflare major changesets while the prerelease metadata is configured and documents how to start, advance, change tags, and graduate the prerelease.

---

• 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 is internal release tooling documented in .changeset/README.md.

A picture of a cute animal (not mandatory, but encouraged)

---

[changeset-bot]

⚠️ No Changeset found

Latest commit: 600fc4e

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[workers-devprod]

Codeowners approval required for this PR:

• @cloudflare/wrangler

Show detailed file reviewers

• .changeset/README.md: [@cloudflare/wrangler]
• .github/changeset-version.js: [@cloudflare/wrangler]
• tools/deployments/tests/changeset-version.test.ts: [@cloudflare/wrangler]
• tools/deployments/tests/validate-changesets.test.ts: [@cloudflare/wrangler]
• tools/deployments/validate-changesets.ts: [@cloudflare/wrangler]

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[pkg-pr-new]

@cloudflare/autoconfig

npm i https://pkg.pr.new/@cloudflare/autoconfig@14899

@cloudflare/config

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create-cloudflare

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@cloudflare/deploy-helpers

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@cloudflare/kv-asset-handler

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miniflare

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@cloudflare/pages-shared

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@cloudflare/unenv-preset

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@cloudflare/vite-plugin

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@cloudflare/vitest-pool-workers

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@cloudflare/workers-auth

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@cloudflare/workers-editor-shared

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@cloudflare/workers-utils

npm i https://pkg.pr.new/@cloudflare/workers-utils@14899

wrangler

npm i https://pkg.pr.new/wrangler@14899

commit: 600fc4e