Add approval template revision administration

README.md

@@ -25,6 +25,19 @@ This module does not own:
 
 Detailed boundary notes are in [docs/APPROVALS_DOMAIN_BOUNDARY.md](docs/APPROVALS_DOMAIN_BOUNDARY.md).
 
+Tenant approval administrators manage reusable chains under
+`Admin > Tenant > Approval templates`. Template edits and publication create
+immutable revisions with content hashes and actor provenance. The history API
+and UI compare any two revisions as structured JSON-pointer changes. The
+request workspace also exposes due-step escalation to approval administrators;
+the server rechecks the due timestamp and request revision before recording the
+transition.
+
+Template API additions:
+
+- `GET /api/v1/approvals/templates/{template_id}/history`
+- `GET /api/v1/approvals/templates/{template_id}/compare`
+
 ## Integrations
 
 Optional integrations: