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>

scripts/run-client-e2e-tests.ps1

@@ -532,16 +532,16 @@ function Initialize-ClientBuilds {
 
     if ($Clients -contains "java") {
         $script:javaCliBat = Join-Path $repoRoot `
-            "clients/java/mxgateway-cli/build/install/mxgateway-cli/bin/mxgateway-cli.bat"
+            "clients/java/zb-mom-ww-mxgateway-cli/build/install/zb-mom-ww-mxgateway-cli/bin/zb-mom-ww-mxgateway-cli.bat"
         if (-not $DryRun) {
             $gradleCommand = Get-Command "gradle.bat", "gradle.cmd", "gradle.exe", "gradle" `
                 -ErrorAction SilentlyContinue | Select-Object -First 1
             if ($null -eq $gradleCommand) {
                 throw "The 'gradle' command was not found on PATH; the Java client e2e flow requires Gradle."
             }
-            Write-Host "Installing the Java client CLI once via :mxgateway-cli:installDist"
+            Write-Host "Installing the Java client CLI once via :zb-mom-ww-mxgateway-cli:installDist"
             Invoke-NativeCommand -FilePath "cmd.exe" `
-                -Arguments @("/c", $gradleCommand.Source, "--quiet", ":mxgateway-cli:installDist") `
+                -Arguments @("/c", $gradleCommand.Source, "--quiet", ":zb-mom-ww-mxgateway-cli:installDist") `
                 -WorkingDirectory (Join-Path $repoRoot "clients/java") | Out-Null
             if (-not (Test-Path $script:javaCliBat)) {
                 throw "The Java client CLI install did not produce '$script:javaCliBat'."
@@ -788,7 +788,7 @@ function Get-ClientCommand {
                 $cliArgs += @("--session-id", $Values.sessionId)
             }
             # The Java CLI is installed once up front (gradle
-            # :mxgateway-cli:installDist) so each call runs the generated
+            # :zb-mom-ww-mxgateway-cli:installDist) so each call runs the generated
             # launcher script directly instead of paying Gradle configuration
             # plus a JVM cold-start per invocation. .NET's Process.Start
             # (UseShellExecute=false) cannot launch a .bat directly, so the