# Gateway Testing

Gateway tests run without installed MXAccess by using fake workers, fake
transports, and in-process gRPC service fakes. Live MXAccess verification belongs
in opt-in integration tests because it depends on installed COM components and
provider state.

## Fake Worker Harness

`FakeWorkerHarness` in `src/ZB.MOM.WW.MxGateway.Tests/Gateway/Workers/Fakes/` provides an
in-process worker side for named-pipe IPC tests. It uses the same
`WorkerFrameReader`, `WorkerFrameWriter`, and `WorkerEnvelope` contract as the
gateway so tests exercise real frame validation and worker-client state changes.

Use the harness when a gateway or session test needs worker behavior without
starting `ZB.MOM.WW.MxGateway.Worker.exe` or loading MXAccess COM. The harness scripts:

- `WorkerHello` and `WorkerReady` startup,
- command replies with matching correlation ids,
- ordered `WorkerEvent` frames,
- `WorkerHeartbeat` frames,
- `WorkerFault` frames,
- shutdown acknowledgements,
- malformed protobuf payloads and oversized frame headers,
- slow or hung workers by withholding a reply.

Session-level tests can connect the harness to the pipe created by
`SessionWorkerClientFactory` with `ConnectToGatewayPipeAsync`. Lower-level
`WorkerClient` tests can use `CreateConnectedPairAsync` to create both pipe ends
inside the test.

`GatewayEndToEndFakeWorkerSmokeTests` composes the real gRPC service,
`SessionManager`, `SessionWorkerClientFactory`, `WorkerClient`, and
`EventStreamService` with a scripted fake worker launcher. The smoke test covers
`OpenSession`, `Register`, `AddItem`, `Advise`, one streamed `OnDataChange`
event, and `CloseSession` without loading MXAccess COM.

## Live MXAccess Smoke

`WorkerLiveMxAccessSmokeTests` in `src/ZB.MOM.WW.MxGateway.IntegrationTests/` composes the
real gRPC service, `SessionManager`, `SessionWorkerClientFactory`,
`WorkerClient`, `WorkerProcessLauncher`, and `ZB.MOM.WW.MxGateway.Worker.exe`. It is
skipped unless `MXGATEWAY_RUN_LIVE_MXACCESS_TESTS=1` is set because it creates
the installed MXAccess COM object and depends on live provider state.

The live smoke opens a gateway session, launches the x86 worker, runs
`Register`, `AddItem`, and `Advise`, waits a bounded time for the first
`OnDataChange` event (skipping any earlier bootstrap/registration-state event),
and closes the session in a `finally` block so the worker gets a graceful
shutdown request even when a command or event assertion fails. Cleanup failures
in that `finally` block are logged rather than thrown, so a real assertion
failure is never masked by a shutdown timeout.

`WorkerLiveMxAccessSmokeTests` additionally covers seven MXAccess parity paths the
fake-worker tests cannot validate:

- a `Write` round-trip against an advised item, asserting both that the reply is
  `Ok` / `MxCommandKind.Write` *and* that the worker emits a matching
  `OnWriteComplete` event for the targeted (server, item) handle pair — the
  same round-trip proof used by `scripts/run-client-e2e-tests.ps1`,
- an `AddItem` against an invalid server handle, asserting the MXAccess failure
  surfaces in the command reply without faulting the gateway transport,
- the `UnAdvise` → `RemoveItem` → `Unregister` teardown chain, asserting each
  step replies `Ok` with the matching `MxCommandKind`, that no further
  `OnDataChange` events arrive for the un-advised pair, and that a second
  `RemoveItem` against the freed handle relays a non-`Ok` MXAccess failure,
- a `WriteSecured` round-trip after `AuthenticateUser`, asserting the reply
  carries `MxCommandKind.WriteSecured` and the credential password never
  appears in the diagnostic message (parity for both the secured-write
  ordering rule and the "do not log secrets" contract),
- an abnormal worker exit (the worker process is killed mid-session) where the
  gateway must transition the session to `SessionState.Faulted` with a
  non-empty fault description carrying a known worker-client classification
  (pipe disconnected / worker faulted / end-of-stream / heartbeat expired),
- the B8 new COM commands — `AuthenticateUser`, `ArchestrAUserToId`, `Suspend`,
  and `Activate` — each asserting a real MXAccess reply (not `InvalidRequest`)
  is returned against an added-but-not-advised item, and
- the buffered-data path — `AddBufferedItem` and `SetBufferedUpdateInterval` —
  asserting the commands round-trip and that the worker delivers at least one
  `OnBufferedDataChange` event (the empty NoData bootstrap) without crashing
  or dropping frames; live §3.2 multi-sample conversion is noted as a residual
  when the rig does not drive sample-bearing buffered batches on demand.

All eight tests are gated by the same `MXGATEWAY_RUN_LIVE_MXACCESS_TESTS=1`
opt-in variable.

Build the worker before running the smoke:

```bash
dotnet build src/ZB.MOM.WW.MxGateway.Worker/ZB.MOM.WW.MxGateway.Worker.csproj -p:Platform=x86
```

Run the smoke explicitly:

```bash
$env:MXGATEWAY_RUN_LIVE_MXACCESS_TESTS = "1"
dotnet test src/ZB.MOM.WW.MxGateway.IntegrationTests/ZB.MOM.WW.MxGateway.IntegrationTests.csproj --filter FullyQualifiedName~WorkerLiveMxAccessSmokeTests
```

Optional live smoke variables:

| Variable | Default | Description |
|----------|---------|-------------|
| `MXGATEWAY_LIVE_MXACCESS_WORKER_EXE` | First existing `ZB.MOM.WW.MxGateway.Worker.exe` under `src/ZB.MOM.WW.MxGateway.Worker/bin/...` | Worker executable path. Set this when running against a packaged worker or a non-default build output. |
| `MXGATEWAY_LIVE_MXACCESS_ITEM` | `TestChildObject.TestInt` | MXAccess item reference used by `AddItem`. |
| `MXGATEWAY_LIVE_MXACCESS_CLIENT_NAME` | `ZB.MOM.WW.MxGateway.IntegrationTests` | Client name passed to `Register`. |
| `MXGATEWAY_LIVE_MXACCESS_EVENT_TIMEOUT_SECONDS` | `15` | Maximum wait for the first `OnDataChange` (also used for the `OnWriteComplete` round-trip and the abnormal-exit fault transition). |
| `MXGATEWAY_LIVE_MXACCESS_WRITE_SECURED_USER` | `admin` | ArchestrA user name passed to `AuthenticateUser` before the `WriteSecured` parity step. |
| `MXGATEWAY_LIVE_MXACCESS_WRITE_SECURED_PASSWORD` | `admin123` | Password paired with the user above. Never logged; the test asserts the value does not appear in the WriteSecured diagnostic message. |

The test output includes session id, worker process id, command status,
HRESULT/status diagnostics, event sequence and handles, close status, and worker
stdout/stderr lines emitted during the run.

## Dev-rig Probes

`src/ZB.MOM.WW.MxGateway.Worker.Tests/Probes/` partitions runtime probes from the regular
Worker.Tests regression suite. The folder is its own
`ZB.MOM.WW.MxGateway.Worker.Tests.Probes` namespace so a discovery filter (e.g. `dotnet
test --filter FullyQualifiedName~ZB.MOM.WW.MxGateway.Worker.Tests.Probes`) can target or
exclude them without enumerating individual class names. The probes are
`[Fact(Skip = "...")]` by default and exist to characterize live AVEVA
behavior on the dev rig, not to gate CI — flip `Skip = null` on the dev box
with installed MXAccess + a running Galaxy provider when running them:

- `AlarmsLiveSmokeTests` — end-to-end smoke for the alarms-over-gateway
  pipeline (`WnWrapAlarmConsumer` + `AlarmDispatcher` +
  `MxAccessAlarmEventSink`) against `\\<machine>\Galaxy!DEV` with the dev rig's
  10-second flip script writing `TestMachine_001.TestAlarm001`.
- `AlarmClientWmProbeTests` — registers as an `AlarmClient` consumer on a real
  hidden message-only window and logs every Win32 message that arrives during
  a fixed pump window. Used to identify the `WM_APP` /
  `RegisterWindowMessage` IDs alarm callbacks use.
- `WnWrapConsumerProbeTests` — instantiates AVEVA's standalone `wnwrapConsumer`
  COM class, subscribes to the dev rig's `\\<machine>\Galaxy!DEV` provider,
  and polls `GetXmlCurrentAlarms2`. The XML payload bypasses the
  `FILETIME→DateTime` auto-marshaling that crashes
  `aaAlarmManagedClient.AlarmClient.GetHighPriAlarm` on this rig.

The probes share the Worker.Tests project (so they can use its `net48`/`x86`
configuration and the installed `ArchestrA.MxAccess` / `aaAlarmManagedClient`
references), but they are not part of the regression contract — a Worker.Tests
run with `Skip` left in place passes them as skipped.

## Live Galaxy Repository

`GalaxyRepositoryLiveTests` in `src/ZB.MOM.WW.MxGateway.IntegrationTests/Galaxy/` exercises
`GalaxyRepository` directly against the `ZB` Galaxy Repository SQL database. It is
skipped unless `MXGATEWAY_RUN_LIVE_GALAXY_TESTS=1` is set because it depends on a
reachable SQL Server instance and deployed Galaxy state — fake-worker tests cannot
cover the SQL browse RPCs.

The suite covers `TestConnectionAsync`, `GetLastDeployTimeAsync`,
`GetHierarchyAsync`, and `GetAttributesAsync`. `GetHierarchyAsync` and
`GetAttributesAsync` assert a non-empty result, so the connected `ZB` database
must contain a deployed Galaxy, not just an empty schema.

Run the Galaxy live tests explicitly:

```bash
$env:MXGATEWAY_RUN_LIVE_GALAXY_TESTS = "1"
dotnet test src/ZB.MOM.WW.MxGateway.IntegrationTests/ZB.MOM.WW.MxGateway.IntegrationTests.csproj --filter FullyQualifiedName~GalaxyRepositoryLiveTests
```

Optional live Galaxy variables:

| Variable | Default | Description |
|----------|---------|-------------|
| `MXGATEWAY_LIVE_GALAXY_CONN` | `Server=localhost;Database=ZB;Integrated Security=True;TrustServerCertificate=True;Encrypt=False;` | Galaxy Repository connection string. Set this when the `ZB` database is on a non-default instance or needs SQL authentication. |

The default connection string targets `ZB` on `localhost` with Windows
authentication, which matches the Galaxy Repository conventions in CLAUDE.md.

## Galaxy Filter Safety

`GalaxyFilterInputSafetyTests` in `src/ZB.MOM.WW.MxGateway.Tests/Galaxy/` covers adversarial
input handling for the Galaxy Repository browse filter layer. It runs in the
unit-test project (no live SQL needed) and complements the live SQL coverage in
`GalaxyRepositoryLiveTests`.

The test class re-frames the original "Galaxy SQL injection" concern (Tests-002 in
`code-reviews/Tests/findings.md`). `GalaxyRepository` issues only four *constant*
SQL statements (`HierarchySql`, `AttributesSql`, `SELECT 1`,
`SELECT time_of_last_deploy FROM galaxy`) — no `DiscoverHierarchyRequest` field
is ever concatenated into a SQL string, so there is no dynamic SQL surface and no
`LIKE`-escaping helper to test. All filters (`TagNameGlob`, `RootTagName`,
template-chain, category, contained-path) are applied **in memory** by
`GalaxyHierarchyProjector` / `GalaxyGlobMatcher` against the cached snapshot.

The adversarial-input matrix (`'`, `' OR '1'='1`, `'; DROP TABLE gobject;--`,
`%`, `_`, `100%_off`, `[abc]`, `Pump'001`) pins the following invariants:

- SQL metacharacters (`'`, `;`) and `LIKE`-wildcards (`%`, `_`) are treated as
  opaque literals by `GalaxyGlobMatcher` — they never act as wildcards, never
  spuriously match unrelated text.
- Only `*` and `?` are glob wildcards.
- `GalaxyGlobMatcher` applies a 100 ms regex timeout so a pathological glob
  (e.g. 5 000 `a` characters plus a literal `!`) completes promptly rather than
  catastrophically backtracking.
- `GalaxyHierarchyProjector` returns zero matches (rather than the whole
  hierarchy) for an adversarial `TagNameGlob` or `TemplateChainContains`, and
  surfaces `NotFound` for an adversarial `RootTagName`.
- The `DiscoverHierarchy` RPC end-to-end returns zero matches for adversarial
  `TagNameGlob` rather than faulting.

These invariants are the real security surface of the Galaxy browse path; the
SQL-injection framing does not apply to a constant-query layer.

## Live LDAP

`DashboardLdapLiveTests` in `src/ZB.MOM.WW.MxGateway.IntegrationTests/` exercises
`DashboardAuthenticator` against the live GLAuth directory. It is skipped unless
`MXGATEWAY_RUN_LIVE_LDAP_TESTS=1` is set because it binds against the GLAuth
service described in `glauth.md`.

The suite builds the authenticator with `GatewayOptions.Dashboard.GroupToRole`
set to `{ GwAdmin: Admin }`. `GwAdmin` is the gateway-specific
dashboard-admin role and is **not** part of the five baseline GLAuth role
groups — it must be provisioned before the LDAP live tests pass.
`AuthenticateAsync_AdminInGwAdminGroup_Succeeds` fails (rather than skips)
when GLAuth has only the baseline groups, so this is a hard prerequisite
beyond "LDAP is up." See the "Adding a gw-specific group" section of
`glauth.md` for the provisioning step that adds `GwAdmin` and grants it to
`admin`.

`DashboardAuthenticator` delegates the LDAP bind and group search to the shared
`ZB.MOM.WW.Auth.Ldap` provider (`LdapAuthService`) and only maps the resulting
groups to dashboard roles via `DashboardGroupRoleMapper`; the bind/search
mechanics that decide each outcome live in that shared provider, not in
`DashboardAuthenticator`.

The suite covers both the success path and the failure outcomes: `admin` whose
LDAP groups resolve to the `Admin` role succeeds and emits the role claim;
`readonly` is denied because no group in their `memberOf` appears in
`GroupToRole`; `admin` with a wrong password fails authentication without leaking
the password into `FailureMessage`; an unknown username fails authentication; and
an unreachable LDAP server is absorbed into a failed result rather than throwing.

Run the LDAP live tests explicitly:

```bash
$env:MXGATEWAY_RUN_LIVE_LDAP_TESTS = "1"
dotnet test src/ZB.MOM.WW.MxGateway.IntegrationTests/ZB.MOM.WW.MxGateway.IntegrationTests.csproj --filter FullyQualifiedName~DashboardLdapLiveTests
```

## Client E2E Scripts

`scripts/discover-testmachine-tags.ps1` queries the ZB Galaxy Repository for the
deployed runtime references used by the live client e2e scripts. It reads
`TestMachine_001` through `TestMachine_020` and the expected attributes:

- `ProtectedValue`
- `TestChangingInt`
- `TestBoolArray`
- `TestIntArray`
- `TestDateTimeArray`
- `TestStringArray`

The discovery output includes the exact `fullTagReference`, data type, array
dimension, and security classification. The array attributes are expected to be
dimension 50. `ProtectedValue` has security classification 2 and requires
secured write semantics; the current client CLI e2e runner subscribes to it but
does not attempt a normal `Write`.

Run discovery directly when validating the Galaxy Repository inputs:

```powershell
powershell -ExecutionPolicy Bypass -File scripts/discover-testmachine-tags.ps1 -Json
```

`scripts/run-client-e2e-tests.ps1` drives the .NET, Go, Rust, Python, and Java
client CLIs through a live gateway session. The gateway and worker are assumed
to be already running at `-Endpoint`; the script does not start or stop them.
For each client it runs these phases, then closes the session in a `finally`
path and writes a JSON report under `artifacts/e2e/`:

1. **Session + register** — opens one session and registers.
2. **Bulk** — verifies `SubscribeBulk` / `UnsubscribeBulk` on a bounded tag
   subset (skip with `-SkipBulk`).
3. **Add-item / advise** — adds and advises every discovered test tag. The
   loop has no `StreamEvents` consumer attached, so advised tags accumulate
   MXAccess change events in the worker event channel
   (`MxGateway:Events:QueueCapacity`); left unbounded it overflows under
   `FailFast` backpressure and faults the worker. Every `-DrainEveryTags`
   advised tags (default 15) the loop connects a short-lived `StreamEvents`
   drain so the gateway pumps that channel empty. `-DrainEveryTags 0` disables
   the drain.
4. **Stream** — asserts a bounded event stream delivers at least one event
   (skip with `-SkipStream`).
5. **Parity** — asserts MXAccess error paths are rejected rather than silently
   succeeding: an invalid item handle and an unknown session id (skip with
   `-SkipParity`).
6. **Auth rejection** — asserts `open-session` is rejected when the API key is
   missing, and (when `-RejectScopeApiKeyEnv` names an insufficient-scope key)
   when the key lacks the required scope. Skip with `-SkipAuth`.
7. **Write round-trip** — *opt-in (`-VerifyWrite`).* Runs right after
   `register`: adds and advises a configurable writable attribute
   (`-WriteAttribute`, default `TestChangingInt`), writes a per-client
   sentinel value, then streams events and asserts an `OnWriteComplete` event
   for that item is observed — proof the write round-tripped through the
   gateway, worker, and MXAccess provider. The written value being echoed back
   in an `OnDataChange` is recorded best-effort (`echoObserved`): a
   provider-driven attribute such as `TestChangingInt` accepts the write but
   immediately overwrites it, so no data-change carries the value back. The
   Rust `stream-events` CLI emits full per-event JSON (`family`, `itemHandle`,
   `value`) so all five clients apply the same checks.

   It is opt-in because it mutates live tag state. The phase fails fast if the
   write command is rejected — e.g. against a gateway whose worker predates
   write support (`MxAccessCommandExecutor` returning `InvalidRequest` for
   `Write`/`Write2`/`WriteSecured`/`WriteSecured2`).
8. **Alarm feed + acknowledge** — *opt-in (`-VerifyAlarms`).* Runs after the
   stream phase. Exercises the two session-less alarm subcommands against the
   gateway's central alarm monitor: `stream-alarms` reads a bounded slice of
   the feed (`-AlarmStreamMax`, default 1 — the feed's first message always
   arrives immediately, whereas later ones depend on live transitions) and
   asserts at least one `AlarmFeedMessage`; `acknowledge-alarm` acknowledges
   `-AlarmReference` (default `Galaxy!TestArea.TestMachine_001.TestAlarm001`)
   and asserts the RPC round-trips. The native ack outcome is not asserted —
   it depends on whether that alarm is currently active.

   It is opt-in because it depends on the gateway's central alarm monitor
   being enabled (`MxGateway:Alarms:Enabled`) and a live alarm provider.

Each client CLI is driven through one long-lived `batch` process. Every CLI
exposes a `batch` subcommand: a process that reads one command line from stdin,
runs it through the normal subcommand dispatch, writes the JSON result, then a
line containing exactly `__MXGW_BATCH_EOR__`. The harness launches one such
process per client and pings the ~250 operations of the flow through it, so the
process — and, for the JVM, the runtime — cold-start is paid once per client
instead of once per operation. A command that fails inside the batch process
writes its `{"error":...}` envelope and the loop continues; the harness treats
that envelope as the operation failure (used by the parity and auth phases).

Before the per-client phases run, the script builds the .NET CLI
(`dotnet build`) and installs the Java CLI (`gradle :mxgateway-cli:installDist`)
once, so the `batch` process launches straight from the compiled exe / the
installed launcher. The Go, Rust, and Python batch processes are launched via
`go run` / `cargo run` / `python -m`, which compile-or-start once when that
single per-client process starts.

Build the gateway and worker, start the gateway, and provide a valid API key
before running the client e2e script:

```powershell
$env:MXGATEWAY_API_KEY = "<api-key>"
powershell -ExecutionPolicy Bypass -File scripts/run-client-e2e-tests.ps1
```

Useful runner options:

```powershell
powershell -ExecutionPolicy Bypass -File scripts/run-client-e2e-tests.ps1 -Clients dotnet,python -MachineStart 1 -MachineEnd 2
powershell -ExecutionPolicy Bypass -File scripts/run-client-e2e-tests.ps1 -BulkTagCount 10
powershell -ExecutionPolicy Bypass -File scripts/run-client-e2e-tests.ps1 -SkipStream
powershell -ExecutionPolicy Bypass -File scripts/run-client-e2e-tests.ps1 -SkipBulk
# Write round-trip (opt-in): point at a writable scalar attribute and its
# value type.
powershell -ExecutionPolicy Bypass -File scripts/run-client-e2e-tests.ps1 -VerifyWrite -WriteAttribute TestChangingInt -WriteType int32
# Alarm feed + acknowledge (opt-in): needs MxGateway:Alarms:Enabled on the gateway.
powershell -ExecutionPolicy Bypass -File scripts/run-client-e2e-tests.ps1 -VerifyAlarms -AlarmReference "Galaxy!TestArea.TestMachine_001.TestAlarm001"
# Auth rejection: also assert an insufficient-scope key is denied.
powershell -ExecutionPolicy Bypass -File scripts/run-client-e2e-tests.ps1 -RejectScopeApiKeyEnv MXGATEWAY_READONLY_API_KEY
# Run all five clients concurrently as isolated child processes.
powershell -ExecutionPolicy Bypass -File scripts/run-client-e2e-tests.ps1 -Parallel
# Validate the flow offline (prints commands, contacts no gateway).
powershell -ExecutionPolicy Bypass -File scripts/run-client-e2e-tests.ps1 -DryRun
powershell -ExecutionPolicy Bypass -File scripts/run-client-e2e-tests.ps1 -Endpoint localhost:5000 -ApiKeyEnv MXGATEWAY_API_KEY
```

When `-VerifyWrite` is enabled, the write round-trip fails loudly if the write
command is rejected, if `-WriteAttribute` does not name a writable scalar
attribute, or if no `OnWriteComplete` event is observed for the written item
within `-WriteEchoMaxEvents` (default 200) streamed events. Raise
`-WriteEchoMaxEvents` if the gateway's per-session event backlog is large
enough to push `OnWriteComplete` past that bound.

## Focused Commands

Run the cross-language smoke matrix tests after changing the documented client
smoke command list:

```bash
dotnet test src/ZB.MOM.WW.MxGateway.Tests/ZB.MOM.WW.MxGateway.Tests.csproj --filter FullyQualifiedName~CrossLanguageSmokeMatrixTests
```

Run the parity fixture matrix tests after changing the integration parity
scenario list:

```bash
dotnet test src/ZB.MOM.WW.MxGateway.Tests/ZB.MOM.WW.MxGateway.Tests.csproj --filter FullyQualifiedName~ParityFixtureMatrixTests
```

Run the fake worker tests after changing gateway worker IPC, session startup, or
event streaming behavior:

```bash
dotnet test src/ZB.MOM.WW.MxGateway.Tests/ZB.MOM.WW.MxGateway.Tests.csproj --filter FullyQualifiedName~FakeWorkerHarnessTests
dotnet test src/ZB.MOM.WW.MxGateway.Tests/ZB.MOM.WW.MxGateway.Tests.csproj --filter FullyQualifiedName~SessionWorkerClientFactoryFakeWorkerTests
dotnet test src/ZB.MOM.WW.MxGateway.Tests/ZB.MOM.WW.MxGateway.Tests.csproj --filter FullyQualifiedName~GatewayEndToEndFakeWorkerSmokeTests
dotnet test src/ZB.MOM.WW.MxGateway.Tests/ZB.MOM.WW.MxGateway.Tests.csproj --filter FullyQualifiedName~WorkerClientTests
dotnet test src/ZB.MOM.WW.MxGateway.Worker.Tests/ZB.MOM.WW.MxGateway.Worker.Tests.csproj -p:Platform=x86 --filter FullyQualifiedName~WorkerPipeSessionTests
```

Run the gateway test project after shared gateway test infrastructure changes:

```bash
dotnet test src/ZB.MOM.WW.MxGateway.Tests/ZB.MOM.WW.MxGateway.Tests.csproj
```

## Continuous Integration

CI runs on Gitea Actions (`.gitea/workflows/ci.yml`; origin is Gitea at
`gitea.dohertylan.com`) on every push and pull request. The pipeline is split by
runtime because the x86 Worker cannot build on Linux:

- **`portable`** (Linux runner) — builds `src/ZB.MOM.WW.MxGateway.NonWindows.slnx`,
  runs the codegen/descriptor freshness guard (`scripts/check-codegen.ps1`), runs the
  gateway fake-worker tests, and builds/tests the clients that run on Linux: .NET client
  build, Go (`gofmt` + `go build` + `go test`), Rust (`cargo fmt --check` + `cargo test`
  + `cargo clippy -D warnings`), and Python (`pytest`).
- **`java`** (Linux, JDK 17) — `gradle test`. The protobuf gradle plugin rewrites
  `MxaccessGateway.java` with spurious protobuf-runtime-version churn on every build, so
  when no `.proto` changed the job reverts that one file (`git checkout`) before asserting
  the generated tree is clean. The dev Mac has no JRE, so Java verification is CI-only.
- **`windows`** (self-hosted windev runner) — the only host that builds the **x86 /
  net48 Worker and Worker.Tests**; these are Windows-only and out of scope for the Linux
  jobs. This job also proves the net48 build against the committed `Generated/` (the
  definitive guard for the "regenerate and commit `Generated/`" rule).
- **`live-mxaccess`** (self-hosted, MXAccess-installed) — scheduled only
  (`MXGATEWAY_RUN_LIVE_MXACCESS_TESTS=1`); never gates a push.

The freshness guard `scripts/check-codegen.ps1` fails the build when the committed
client descriptor set or the C# `Generated/` no longer matches the current `.proto`
sources — the codegen drift class this repo has hit repeatedly (stale client
descriptors, net48 `CS0246` on unregenerated protos). See
[Client Proto Generation](./ClientProtoGeneration.md) and [Contracts](./Contracts.md).

## Related Documentation

- [Cross-Language Smoke Matrix](./CrossLanguageSmokeMatrix.md)
- [Parity Fixture Matrix](./ParityFixtureMatrix.md)
- [Gateway Process Design](./GatewayProcessDesign.md)
- [Worker Frame Protocol](./WorkerFrameProtocol.md)
- [MXAccess Worker Instance Detailed Design](./MxAccessWorkerInstanceDesign.md)
