chore(changeset): plugin-approvals decision attachments

Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016ypkQikZ55oWUHUnMebwXA

Author: claude

.changeset/approvals-decision-attachments.md

@@ -0,0 +1,18 @@
+---
+"@objectstack/plugin-approvals": minor
+---
+
+feat(approvals): declare file attachments on approve/reject decisions
+
+The declared `approval_approve` / `approval_reject` actions on
+`sys_approval_request` gain an optional multi-file `attachments` param
+(`type: 'file'`, `multiple`). The console renders `type:'file'` action params
+through the shared upload widget (objectui ADR-0059) and POSTs the resolved
+`attachments: string[]`, so a reviewer can attach supporting files to a
+decision through the generic declared-action dialog — letting the approvals
+inbox retire its hand-wired attachment composer (objectui#2698).
+
+Purely additive metadata: the decision route already forwards
+`body.attachments` to `ApprovalService.decide`, and the
+`sys_approval_action.attachments` column (file, multiple) already persists them
+(#3266/#3274). No service or route change.