fix(miniflare): allow mixed r2Buckets records

[petebacondarwin]

Supersedes #11789 (original PR by @shellscape via charlie-labs fork). Moved to an internal branch to apply necessary updates (rebase, vitest test migration, changeset).

The R2OptionsSchema Zod validation previously required all values in an r2Buckets record to be either all strings or all objects. This prevented mixed records like:

r2Buckets: {
  LOCAL_BUCKET: "local-bucket",
  REMOTE_BUCKET: { id: "remote-bucket" },
}

The fix collapses the two separate z.record() branches into a single z.record(z.union([...])) so each value is validated independently. The runtime (namespaceEntries()) already supported mixed records — this brings the schema in line.

---

• 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: Bug fix to existing behavior, no new API surface

[changeset-bot]

🦋 Changeset detected

Latest commit: aaf5769

The changes in this PR will be included in the next version bump.

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[workers-devprod]

Codeowners approval required for this PR:

• ✅ @cloudflare/wrangler

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[github-actions]

✅ All changesets look good

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commit: aaf5769

[penalosa]

Do other binding types have the same problem?

[petebacondarwin]

Do other binding types have the same problem?

@penalosa - I am investigating

[petebacondarwin]

Do other binding types have the same problem?

@penalosa - I am investigating

These also need updating:

• [miniflare] Fix mixed kvNamespaces and d1Databases records #12986
• [miniflare] Fix mixed pipelines records #12987