rename: apply ZB.MOM.WW prefix to all client SDKs + fix pre-existing alarm-RPC breaks

Rename across every client surface using each language's idiomatic convention:

  * .NET   clients/dotnet/MxGateway.Client[.Cli|.Tests]/
             -> clients/dotnet/ZB.MOM.WW.MxGateway.Client[.Cli|.Tests]/
             namespaces -> ZB.MOM.WW.MxGateway.Client[.Cli|.Tests]
             contracts ProjectReference repointed to ZB.MOM.WW.MxGateway.Contracts
             sln migrated to slnx (dotnet sln migrate)
  * Python src/mxgateway -> src/zb_mom_ww_mxgateway
             src/mxgateway_cli -> src/zb_mom_ww_mxgateway_cli
             distribution: mxaccess-gateway-client -> zb-mom-ww-mxaccess-gateway-client
  * Rust   crate: mxgateway-client -> zb-mom-ww-mxgateway-client
             build.rs proto path repointed
  * Java   subprojects: mxgateway-{client,cli} -> zb-mom-ww-mxgateway-{client,cli}
             packages com.dohertylan.mxgateway -> com.zb.mom.ww.mxgateway
             group   com.dohertylan.mxgateway -> com.zb.mom.ww.mxgateway
             rootProject mxaccessgw-java -> zb-mom-ww-mxaccessgw-java
  * Go     generate-proto.ps1 proto path repointed; module path and
             package mxgateway kept (Go convention).
  * proto-inputs.json: generatedOutputs.python updated to new package path.
  * scripts/run-client-e2e-tests.ps1: Java CLI install path + gradle task
             updated to zb-mom-ww-mxgateway-cli.

CLI binary names (mxgw, mxgw-py, mxgw-go, mxgateway-cli) and wire-level
identifiers (MXGATEWAY_* env vars, the mxgw_<id>_<secret> API key
prefix, protobuf package names like mxaccess_gateway.v1, all MXAccess
references) intentionally NOT renamed.

Fix pre-existing alarms-over-gateway breaks unblocked by the rename:

  * mxaccess_gateway.proto: add missing public message QueryActiveAlarmsRequest
    {session_id, client_correlation_id, alarm_filter_prefix} and missing
    rpc QueryActiveAlarms(QueryActiveAlarmsRequest) returns
    (stream ActiveAlarmSnapshot). All four typed clients referenced
    these but they were absent from the proto.
  * MxAccessGatewayService.QueryActiveAlarms: implement the new RPC on
    the server, streaming from IGatewayAlarmService.CurrentAlarms with
    optional alarm_filter_prefix filter.
  * clients/dotnet/.../DiscoverHierarchyOptions.cs: add the hand-written
    .NET POCO that wraps DiscoverHierarchyRequest (referenced by
    GalaxyRepositoryClient.DiscoverHierarchyAsync but never authored).
  * Drop retired session_id field references from
    AcknowledgeAlarmRequest/AcknowledgeAlarmReply test fixtures across
    .NET, Rust, Go, and Python clients.
  * Rust integration test: add the missing stream_alarms impl on the
    fake MxAccessGateway server (the trait gained the method, fake
    didn't).
  * Rust CLI test: bump expected gatewayProtocolVersion 2 -> 3.

Regenerated artifacts updated in this commit:
  * src/ZB.MOM.WW.MxGateway.Contracts/Generated/{MxaccessGateway,MxaccessGatewayGrpc}.cs
  * clients/python/src/zb_mom_ww_mxgateway/generated/*_pb2{,_grpc}.py
  * clients/go/internal/generated/*.pb.go
(C# regenerated by Grpc.Tools on contracts build; Python and Go via
their generate-proto.ps1 scripts; Rust regenerates from .proto via
tonic-build at compile time so no checked-in artefact.)

Verification: 472 server tests, 275 worker tests (9 dev-rig skipped),
18 integration tests (live MxAccess + LDAP + Galaxy), 57 .NET client
tests, 32 Rust workspace tests, 39 Python tests, all Go packages, and
gradle build for Java all pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

clients/go/mxgateway/alarms_test.go

@@ -20,7 +20,6 @@ import (
 func TestAcknowledgeAlarmSendsRequestAndReturnsReply(t *testing.T) {
 	fake := &fakeGatewayWithAlarms{
 		acknowledgeReply: &pb.AcknowledgeAlarmReply{
-			SessionId:     "session-1",
 			CorrelationId: "corr-1",
 			ProtocolStatus: &pb.ProtocolStatus{
 				Code: pb.ProtocolStatusCode_PROTOCOL_STATUS_CODE_OK,
@@ -35,7 +34,6 @@ func TestAcknowledgeAlarmSendsRequestAndReturnsReply(t *testing.T) {
 	defer cleanup()
 
 	reply, err := client.AcknowledgeAlarm(context.Background(), &pb.AcknowledgeAlarmRequest{
-		SessionId:           "session-1",
 		ClientCorrelationId: "corr-1",
 		AlarmFullReference:  "Tank01.Level.HiHi",
 		Comment:             "investigating",
@@ -81,7 +79,6 @@ func TestAcknowledgeAlarmMapsUnauthenticated(t *testing.T) {
 	defer cleanup()
 
 	_, err := client.AcknowledgeAlarm(context.Background(), &pb.AcknowledgeAlarmRequest{
-		SessionId:          "session-1",
 		AlarmFullReference: "Tank01.Level.HiHi",
 		OperatorUser:       "alice",
 	})
@@ -193,7 +190,7 @@ func (s *fakeGatewayWithAlarms) AcknowledgeAlarm(ctx context.Context, req *pb.Ac
 		return s.acknowledgeReply, nil
 	}
 	return &pb.AcknowledgeAlarmReply{
-		SessionId: req.GetSessionId(),
+		CorrelationId: req.GetClientCorrelationId(),
 		ProtocolStatus: &pb.ProtocolStatus{
 			Code: pb.ProtocolStatusCode_PROTOCOL_STATUS_CODE_OK,
 		},