[aicayzer]

Summary

A folder's settings can no longer hold a backref filter or a first_placement directory with a .. name: the server refuses both with validation_error. The Sync a folder page now says so. Follows withmarfa/marfa#2519; closes withmarfa/marfa#2485 together with it.

Changes

• content/docs/run/sync-a-folder.mdx: one sentence on the backref refusal where the query is described, and one paragraph on the .. refusal where settings are changed.

Testing

• pnpm exec vitest run: 709 tests pass, including the content lint.
• Not run: a site build.

Notes for reviewers

• The Folder catalog page is generated from marfa's type description, so its first_placement and query rows change through marfa and the next sync, not here.

Checklist

• The title is a scoped Conventional Commit.
• New behavior has a test that was seen failing first, or no test was needed and the reason is above.
• Docs, comments and the contract still say what is true after this change.