Adds NEXT_PUBLIC_CLOSED_PO_ATTACHMENTS_ENABLED. When on, a CLOSED PO's own
submitter -- plus Accounts / Manager / SuperUser -- can attach documents to
it, so POs whose uploads were lost to the document-upload bug can be fixed
without reopening them. Off by default, so production stays unchanged until
enabled.
- lib/permissions.ts: canAddClosedPoAttachment(role, { isSubmitter }) gated
by the flag; allowed roles are ACCOUNTS/MANAGER/SUPERUSER (plus the PO's
own submitter regardless of role).
- uploadPoDocuments: a CLOSED PO is otherwise immutable, so it now enforces
the permission server-side; the normal create/receipt flows upload while
the PO is pre-CLOSED and are unaffected.
- po-detail.tsx: when allowed, the Attachments card renders an uploader
(ClosedPoAttachmentUploader) and shows even when the PO has no docs yet.
- Enabled on staging (staging-up.sh) so the remediation can be exercised;
documented in .env.example and CLAUDE.md.
Tests: closed-po-attachments.test.ts covers the flag-on role matrix (own
submitter / Accounts / Manager / SuperUser allowed; other submitter-role and
auditor refused; non-closed PO unaffected); po-document-upload.test.ts adds
the flag-off case (closed PO stays immutable). Full unit + integration suites
green; tsc clean.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
