chore(registry): normalize RFC standard naming (remove space before number)

[Mehrn0ush]

Summary

Some standard.name values use "RFC " (e.g., "RFC 5116", "RFC 3686"), while the registry predominantly uses "RFC" (e.g., "RFC9180").

Location

schema/cryptography-defs.json

• AES standard list includes "RFC 5116"
• AES-CTR-HMAC-SHA1-96 suite standard includes "RFC 3686"

Proposed resolution

Normalize "RFC 5116" -> "RFC5116" and "RFC 3686" -> "RFC3686" for consistency across the registry.

[stevespringett]

cc: @bhess