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/python/README.md

@@ -1,7 +1,7 @@
 # Python Client
 
 The Python client package contains generated MXAccess Gateway protobuf
-bindings, the async `mxgateway` package, and the `mxgw-py` test CLI. The
+bindings, the async `zb_mom_ww_mxgateway` package, and the `mxgw-py` test CLI. The
 package uses the shared proto inputs documented in
 `../../docs/ClientProtoGeneration.md` so gateway and client contracts stay in
 sync.
@@ -12,13 +12,13 @@ sync.
 clients/python/
   pyproject.toml
   generate-proto.ps1
-  src/mxgateway/
-  src/mxgateway/generated/
-  src/mxgateway_cli/
+  src/zb_mom_ww_mxgateway/
+  src/zb_mom_ww_mxgateway/generated/
+  src/zb_mom_ww_mxgateway_cli/
   tests/
 ```
 
-`src/mxgateway/generated` contains code produced by `grpc_tools.protoc`. Do not
+`src/zb_mom_ww_mxgateway/generated` contains code produced by `grpc_tools.protoc`. Do not
 edit generated files by hand.
 
 ## Regenerating Protobuf Bindings
@@ -74,7 +74,7 @@ The wheel exposes the `mxgw-py` console script.
 The library is async-first:
 
 ```python
-from mxgateway import GatewayClient
+from zb_mom_ww_mxgateway import GatewayClient
 
 async with await GatewayClient.connect(
     endpoint="localhost:5000",
@@ -107,7 +107,7 @@ enumerate the deployed object hierarchy plus each object's dynamic
 attributes:
 
 ```python
-from mxgateway import GalaxyRepositoryClient
+from zb_mom_ww_mxgateway import GalaxyRepositoryClient
 
 async with await GalaxyRepositoryClient.connect(
     endpoint="localhost:5000",
@@ -142,7 +142,7 @@ the caller already has the current state cached:
 
 ```python
 from datetime import datetime, timezone
-from mxgateway import DeployEvent, GalaxyRepositoryClient
+from zb_mom_ww_mxgateway import DeployEvent, GalaxyRepositoryClient
 
 async with await GalaxyRepositoryClient.connect(
     endpoint="localhost:5000",