chore: align slurp config and scaffolding

pkg/crypto/key_manager_stub.go

@@ -0,0 +1,23 @@
+package crypto
+
+import "time"
+
+// GenerateKey returns a deterministic placeholder key identifier for the given role.
+func (km *KeyManager) GenerateKey(role string) (string, error) {
+	return "stub-key-" + role, nil
+}
+
+// DeprecateKey is a no-op in the stub implementation.
+func (km *KeyManager) DeprecateKey(keyID string) error {
+	return nil
+}
+
+// GetKeysForRotation mirrors SEC-SLURP-1.1 key rotation discovery while remaining inert.
+func (km *KeyManager) GetKeysForRotation(maxAge time.Duration) ([]*KeyInfo, error) {
+	return nil, nil
+}
+
+// ValidateKeyFingerprint accepts all fingerprints in the stubbed environment.
+func (km *KeyManager) ValidateKeyFingerprint(role, fingerprint string) bool {
+	return true
+}