feat(registry): add OPAQUE (RFC 9807) (#796)

## Summary
Add OPAQUE-3DH to `schema/cryptography-defs.json` based on RFC 9807.

## References
- Issue: #795
- Spec: RFC 9807 https://doi.org/10.17487/RFC9807

Note: RFC 9380 (Hashing to Elliptic Curves) is referenced by OPAQUE as a
building block, but RFC 9807 is the protocol specification.

## Change
Insert `family: OPAQUE` alphabetically between `MQV` and `MILENAGE`.

## Validation
- `python3 -m json.tool schema/cryptography-defs.json` (JSON OK)

Author: stevespringett

schema/cryptography-defs.json

@@ -1028,6 +1028,21 @@
         }
       ]
     },
+    {
+      "family": "OPAQUE",
+      "standard": [
+        {
+          "name": "RFC9807",
+          "url": "https://doi.org/10.17487/RFC9807"
+        }
+      ],
+      "variant": [
+        {
+          "pattern": "OPAQUE-3DH[-{group}][-{hashFunction}][-{ksf}][-{kdf}][-{mac}]",
+          "primitive": "key-agree"
+        }
+      ]
+    },
     {
       "family": "MILENAGE",
       "standard": [

schema/cryptography-defs.schema.json

@@ -285,6 +285,7 @@
         "ML-DSA",
         "ML-KEM",
         "MQV",
+        "OPAQUE",
         "PBES1",
         "PBES2",
         "PBKDF1",