Create platform design proposal for future cryptography key needs.

The proposal needs to cover the following:
* multiple keys in memory, supporting key rotation
* reading keys dynamically from disk without restart
* multiple key types, RSA, BLS, Schnorr, EC, etc.
* Multiple encoding schemes: PEM, PKCS#8,12,etc, ASCII Armored
* Lifecycle Management
* How do we guarantee destruction?
* Storage on disk
* Key Management Practices

No files, tests, or entry points are named. Review the existing cryptography and key-management approach in the repository, then draft a platform design proposal covering key rotation, dynamic loading, supported key types and encodings, lifecycle and destruction, disk storage, and management practices.

Written by the indexing model from the issue text.