feat(client): add client metadata and wallet visibility support

protobufs/client.proto

@@ -5,8 +5,15 @@ package arbiter.client;
 import "evm.proto";
 import "google/protobuf/empty.proto";
 
+message ClientInfo {
+  string name = 1;
+  string description = 2;
+  string version = 3;
+}
+
 message AuthChallengeRequest {
   bytes pubkey = 1;
+  ClientInfo client_info = 2;
 }
 
 message AuthChallenge {

protobufs/evm.proto

@@ -46,7 +46,7 @@ message VolumeRateLimit {
 }
 
 message SharedSettings {
-  int32 wallet_id = 1;
+  int32 visibility_id = 1;
   uint64 chain_id = 2;
   optional google.protobuf.Timestamp valid_from = 3;
   optional google.protobuf.Timestamp valid_until = 4;
@@ -139,9 +139,8 @@ message TransactionEvalError {
 
 // --- UserAgent grant management ---
 message EvmGrantCreateRequest {
-  int32 client_id = 1;
-  SharedSettings shared = 2;
-  SpecificGrant specific = 3;
+  SharedSettings shared = 1;
+  SpecificGrant specific = 2;
 }
 
 message EvmGrantCreateResponse {
@@ -165,13 +164,13 @@ message EvmGrantDeleteResponse {
 // Basic grant info returned in grant listings
 message GrantEntry {
   int32 id = 1;
-  int32 client_id = 2;
+  int32 visibility_id = 2;
   SharedSettings shared = 3;
   SpecificGrant specific = 4;
 }
 
 message EvmGrantListRequest {
-  optional int32 wallet_id = 1;
+  optional int32 visibility_id = 1;
 }
 
 message EvmGrantListResponse {

protobufs/user_agent.proto

@@ -2,6 +2,7 @@ syntax = "proto3";
 
 package arbiter.user_agent;
 
+import "client.proto";
 import "evm.proto";
 import "google/protobuf/empty.proto";
 
@@ -80,6 +81,7 @@ enum VaultState {
 
 message ClientConnectionRequest {
   bytes pubkey = 1;
+  arbiter.client.ClientInfo info = 2;
 }
 
 message ClientConnectionResponse {