security(hsm): move X25519 ECDH into PKCS#11 and enable full in-token…#22
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… hybrid decrypt - Extend HSM boundary with optional token-resident X25519 identity and “full in-token” decrypt mode - Implement PKCS#11 hybrid v1 decrypt path: KEM derive_key + ECDH1_DERIVE (EC_MONTGOMERY) + concat + HKDF + AES-GCM - Update GatewayHsmSecurityProvider to avoid host-held X25519 secrets when token provides X25519 - Add provisioning example for generating/exporting X25519 public key from PKCS#11 token - Add regression test + document invariant: no silent fallback to exporting shared secrets
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… hybrid decrypt