feat(workbench): add runtime GIS and sample integrations

app/services/content_digest.py

@@ -0,0 +1,18 @@
+"""RFC 8785 canonical JSON hashing shared by persisted records."""
+
+from hashlib import sha256
+
+import rfc8785
+
+from app.domain.domain_errors import DomainError
+
+
+def canonical(value: object) -> bytes:
+    try:
+        return rfc8785.dumps(value)
+    except rfc8785.CanonicalizationError as exc:
+        raise DomainError("SCHEMA_INVALID", "Content is not canonicalizable JSON") from exc
+
+
+def digest(value: object) -> str:
+    return "sha256:" + sha256(canonical(value)).hexdigest()