feat!: self-only default write access for auth collections

[DanRibbens]

Summary

• Adds defaultAuthAccess that constrains update/delete/unlock on auth-enabled collections to { id: { equals: req.user.id } } when req.user.collection matches the target collection slug, and denies otherwise.
• Rewires addDefaultsToCollectionConfig to use defaultAuthAccess for update/delete/unlock when collection.auth is truthy. read, create, readVersions, and admin continue to use defaultAccess. Non-auth collections are untouched.
• Documents the new default behavior in docs/access-control/collections.mdx under Update, Delete, and Unlock.

BREAKING CHANGE

On auth-enabled collections, the default update, delete, and unlock access is now self-only. Apps that relied on any authenticated admin-collection user being able to modify other users must add an explicit access.update (and/or delete, unlock) function to restore prior behavior. Example:

access: {
  update: ({ req }) => Boolean(req.user), // or a role-aware equivalent
}

The built-in unlock endpoint is effectively disabled by default and now requires an explicit access.unlock for admin-to-user unlock flows.

Cross-collection safety: an authenticated user in auth collection A can no longer update/delete/unlock docs in a different auth collection B, even if IDs collide (a real risk on Postgres where serial IDs are shared across collections).

Test plan

• pnpm run test:int auth — 104 pass (includes 7 new default-access tests)
• pnpm run test:int access-control — 41 pass
• pnpm run test:int custom-strategy — 1 pass
• pnpm run build:core — pass
• Manual: pnpm run dev auth, log in as one user, attempt to update another via the admin UI — expect 403/not-found; self-update expected to succeed.

🤖 Generated with Claude Code

[github-actions]

📦 esbuild Bundle Analysis for payload

This analysis was generated by esbuild-bundle-analyzer. 🤖

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Details

Next to the size is how much the size has increased or decreased compared with the base branch of this PR.

• ‼️: Size increased by 20% or more. Special attention should be given to this.
• ⚠️: Size increased in acceptable range (lower than 20%).
• ✅: No change or even downsized.
• 🗑️: The out file is deleted: not found in base branch.
• 🆕: The out file is newly found: will be added to base branch.