48e901cac1
Replaces the old "untagged" sentinel tag with a proper per-file workflow status: needs_review starts true on upload/import and is cleared by an explicit action (no auto-clear on tagging). Surfaced as a filter token (r=1 needs review, r=0 done) so it combines with tag/MIME conditions, and toggled via POST /files/bulk/review (single id or many, edit-ACL enforced, audit-logged as file_review). needs_review lives on data.files (column added to the original 003 migration, partial index in 006, action type seeded in 007). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>