Fix dangling RFC 3339 reference and non-reserved example domain

Remove RFC 3339 from normative references (not cited in text;
timestamps use NumericDate per RFC 7519). Change bank.com to
bank.example in compensation use case per RFC 2606.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

draft-nennemann-wimse-execution-context-00.md

@@ -25,7 +25,6 @@ author:
 normative:
   RFC2119:
   RFC8174:
-  RFC3339:
   RFC7515:
   RFC7519:
   RFC7518:
@@ -1036,9 +1035,9 @@ a cryptographic link to the original task:
 
 ~~~json
 {
-  "iss": "spiffe://bank.com/agent/operations",
-  "sub": "spiffe://bank.com/agent/operations",
-  "aud": "spiffe://bank.com/system/ledger",
+  "iss": "spiffe://bank.example/agent/operations",
+  "sub": "spiffe://bank.example/agent/operations",
+  "aud": "spiffe://bank.example/system/ledger",
   "iat": 1772150550,
   "exp": 1772151150,
   "wid": "d3e4f5a6-b7c8-9012-def0-123456789012",
@@ -1047,7 +1046,7 @@ a cryptographic link to the original task:
   "par": ["550e8400-e29b-41d4-a716-446655440003"],
   "pol": "compensation_policy_v1",
   "pol_decision": "approved",
-  "pol_enforcer": "spiffe://bank.com/human/compliance-officer",
+  "pol_enforcer": "spiffe://bank.example/human/compliance-officer",
   "compensation_required": true,
   "compensation_reason": "policy_violation_in_parent_trade"
 }