fix: validate runtime RSA keypairs INF-177

[chriszhao1988]

Scope

Add an opt-in RSA private/public keypair validation gate for runtime secret files.

Behavior

• Validates configured private and public paths before any SSH transfer or container shutdown.
• Rejects invalid RSA PEMs and public keys that do not match the supplied private key.
• Keeps secret contents out of logs and retains runner cleanup behavior.

Validation

• Workflow YAML parsed successfully.
• Synthetic RSA fixture accepted a matching pair and rejected a mismatched public key.

Consumer

Platform PR #44 adds the opt-in input for development, testnet, and mainnet deployments.

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