[client] Add netbird agent-network ls and env commands

Surface the caller-scoped Agent Network setup on the CLI. Both
commands dial management directly with the active profile's WireGuard
key — the same path foreground login uses — so no daemon proto or
engine wiring is needed for the proof of concept.

netbird agent-network ls prints the proxy endpoint, the authorized
providers, and the allowed models (--json for the raw response).

netbird agent-network env prints POSIX export lines for
Anthropic-compatible tools such as Claude Code, applied with
eval "$(netbird agent-network env)": ANTHROPIC_BASE_URL points at
the account's proxy endpoint and ANTHROPIC_AUTH_TOKEN carries a
placeholder (the proxy authenticates by tunnel peer and injects the
real upstream credentials). A model is never guessed: ANTHROPIC_MODEL
is exported only when exactly one model is allowed or --model pins
one; anything ambiguous is printed as comment lines instead.

"Not available for this peer" is an answer, not an error: both
commands exit 0 with a plain message (on stderr for env, keeping the
eval a harmless no-op).

Linear: NET-1399

shared/management/client/client.go

@@ -34,4 +34,8 @@ type Client interface {
 	CreateExpose(ctx context.Context, req ExposeRequest) (*ExposeResponse, error)
 	RenewExpose(ctx context.Context, domain string) error
 	StopExpose(ctx context.Context, domain string) error
+	// GetAgentNetworkSetup returns the Agent Network connection info the
+	// calling peer's groups authorize: proxy endpoint plus effective
+	// providers and models.
+	GetAgentNetworkSetup(ctx context.Context) (*proto.AgentNetworkSetupResponse, error)
 }

shared/management/client/grpc.go

@@ -914,6 +914,38 @@ func (c *GrpcClient) StopExpose(ctx context.Context, domain string) error {
 	return err
 }
 
+// GetAgentNetworkSetup asks the management server for the Agent Network
+// connection info the calling peer's groups authorize.
+func (c *GrpcClient) GetAgentNetworkSetup(ctx context.Context) (*proto.AgentNetworkSetupResponse, error) {
+	serverPubKey, err := c.getServerPublicKey()
+	if err != nil {
+		return nil, err
+	}
+
+	encReq, err := encryption.EncryptMessage(*serverPubKey, c.key, &proto.AgentNetworkSetupRequest{})
+	if err != nil {
+		return nil, fmt.Errorf("encrypt agent network setup request: %w", err)
+	}
+
+	mgmCtx, cancel := context.WithTimeout(ctx, ConnectTimeout)
+	defer cancel()
+
+	resp, err := c.realClient.GetAgentNetworkSetup(mgmCtx, &proto.EncryptedMessage{
+		WgPubKey: c.key.PublicKey().String(),
+		Body:     encReq,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	setupResp := &proto.AgentNetworkSetupResponse{}
+	if err := encryption.DecryptMessage(*serverPubKey, c.key, resp.Body, setupResp); err != nil {
+		return nil, fmt.Errorf("decrypt agent network setup response: %w", err)
+	}
+
+	return setupResp, nil
+}
+
 func fromProtoExposeResponse(resp *proto.ExposeServiceResponse) *ExposeResponse {
 	return &ExposeResponse{
 		ServiceName:      resp.ServiceName,

shared/management/client/mock.go

@@ -25,6 +25,7 @@ type MockClient struct {
 	CreateExposeFunc               func(ctx context.Context, req ExposeRequest) (*ExposeResponse, error)
 	RenewExposeFunc                func(ctx context.Context, domain string) error
 	StopExposeFunc                 func(ctx context.Context, domain string) error
+	GetAgentNetworkSetupFunc       func(ctx context.Context) (*proto.AgentNetworkSetupResponse, error)
 }
 
 func (m *MockClient) IsHealthy() bool {
@@ -136,3 +137,10 @@ func (m *MockClient) StopExpose(ctx context.Context, domain string) error {
 	}
 	return m.StopExposeFunc(ctx, domain)
 }
+
+func (m *MockClient) GetAgentNetworkSetup(ctx context.Context) (*proto.AgentNetworkSetupResponse, error) {
+	if m.GetAgentNetworkSetupFunc == nil {
+		return &proto.AgentNetworkSetupResponse{}, nil
+	}
+	return m.GetAgentNetworkSetupFunc(ctx)
+}