# Testing, Documentation & Underdeveloped Areas — Remediation Design & Implementation

Source review: [60-testing-docs-gaps.md](../60-testing-docs-gaps.md) · Generated: 2026-07-09

This domain has no source-code defects to fix — its findings are process, coverage, documentation-currency, and half-shipped-feature gaps. The remediation therefore centres on standing up CI, filling the highest-value test gaps, finishing (or explicitly re-scoping) the session-resilience epic, and a focused doc-drift + repo-root triage pass. Every citation below was re-verified against the working tree on 2026-07-09; corrections are noted inline.

## Finding index

| ID | Sev | Title | Roadmap | Effort | Depends on | Files |
|----|-----|-------|---------|--------|-----------|-------|
| TST-01 | High | Reconnect/replay has no e2e test and no client consumer | P2 | L | TST-04 | oldtasks.md, clients/*, EventStreamServiceTests.cs |
| TST-02 | High | Reconnect owner re-validation not implemented | P0 | M | TST-04 | Sessions/SessionManager.cs, Grpc/EventStreamService.cs |
| TST-03 | High | No CI exists | P1 | M | — | (new) .gitea/workflows/ or .github/workflows/ |
| TST-04 | High | Session-resilience epic 16/28 tasks unfinished | P2 | L | — | oldtasks.md, docs/plans/2026-06-15-session-resilience.md.tasks.json |
| TST-05 | Medium | Real-worker control/COM paths verified opt-in only | P1 | S | TST-03 | WorkerLiveMxAccessSmokeTests.cs |
| TST-06 | Medium | Dashboard live-data path untested | — | M | — | Dashboard/DashboardLiveDataService.cs |
| TST-07 | Medium | Real-clock sleeps with negative assertions are latent flakes | — | S | — | WorkerClientTests.cs:431, SessionManagerTests.cs:400 |
| TST-08 | Medium | Full-suite orphaned testhost processes | P1 | M | — | Tests fixtures (pipe/hosted-service disposal) |
| TST-09 | Medium | Health checks cover only the auth store | — | M | — | GatewayApplication.cs:71 |
| TST-10 | Medium | Deployment/upgrade undocumented and hand-rolled | — | M | — | (new) docs/Deployment.md, scripts/ |
| TST-11 | Medium | No version discipline on server; client versions drift | P2 | M | — | src/Directory.Build.props, clients/* |
| TST-12 | Medium | CLAUDE.md misstates default retention behaviour | P0 | S | — | CLAUDE.md:79 |
| TST-13 | Medium | gateway.md carries stale design-era sketches | P2 | S | — | gateway.md:291,738,330 |
| TST-14 | Medium | Repo-root working artifacts need triage | P2 | S | — | *-docs-*.md, oldtasks.md, stillpending.md |
| TST-15 | Medium | Dashboard EventsHub has no per-session ACL | P2 | M | TST-04 | Dashboard/Hubs/EventsHub.cs:39 |
| TST-16 | Medium | `Dashboard:ShowTagValues` is a dead flag | — | S | — | Configuration/DashboardOptions.cs:62 |
| TST-17 | Medium | Vendor-gated alarm parity residuals silently lossy | — | S | — | Worker/MxAccess/WnWrapAlarmConsumer.cs:261 |
| TST-18 | Low | Hosted-service wrappers untested | — | S | — | SessionLeaseMonitorHostedService.cs, OrphanWorkerCleanupHostedService.cs |
| TST-19 | Low | Keep FakeWorkerHarness canned replies in lockstep | — | S | — | Tests/Gateway/Workers/Fakes/FakeWorkerHarness.cs |
| TST-20 | Low | E2E script papers over a real advise-without-consumer sharp edge | — | S | — | scripts/run-client-e2e-tests.ps1 |
| TST-21 | Low | Log rotation configured but minimal | — | S | — | Server/appsettings.json:8 |
| TST-22 | Low | Config-shape JSON block omits documented keys | — | S | — | docs/GatewayConfiguration.md:12 |
| TST-23 | Low | Bidirectional `Session` RPC never built | P2 | S | — | gateway.md:330 |
| TST-24 | Low | Client wire behaviour has no automated verification | — | M | TST-03 | clients/*, (new) in-process fake gateway |

---

## TST-01 — Reconnect/replay has no e2e test and no client consumer   `High` · `P2`

**Finding.** The server emits the `ReplayGap` sentinel and replays the ring on reconnect (unit-covered in `src/ZB.MOM.WW.MxGateway.Tests/Gateway/Grpc/EventStreamServiceTests.cs` and `MxAccessGatewayServiceTests.cs`), but epic Task 15 (fake-worker reconnect integration test) and Task 14 (client `ReplayGap` handling in all five clients) remain pending — verified `oldtasks.md:41-44` (`⏳ Task 14 (#121)`, `⏳ Task 15 (#122)`). No client parses the `ReplayGap` message.

**Impact.** The default-on reconnect protocol (`DetachGraceSeconds = 30`, `ReplayBufferCapacity = 1024` — both verified in code, see TST-12) is unproven end-to-end and unusable by every official client: a client that reconnects silently drops the gap marker and cannot tell replayed events from live ones, or that a gap was truncated.

**Design.** Land Tasks 14 and 15 as the completion of Phase 3 (co-designed with TST-02, TST-04). Two parts:
1. **Integration test (Task 15):** drive `FakeWorkerHarness` through advise → detach subscriber (keep session in grace) → emit events into the replay ring → reconnect a new `StreamEvents` with a `last_sequence` cursor → assert the exact replayed set plus a `ReplayGap` when the requested cursor predates the ring. This lives entirely in fakes; no live COM needed.
2. **Client consumers (Task 14):** each client's event-stream reader must surface `ReplayGap` as a typed, observable signal (not a dropped frame). Carry the per-language `optional`/presence-check idiom note from `oldtasks.md:44` — proto3 `optional` message fields need a `HasField`/`Option`/`is not None` presence check per language.

Rejected alternative: advertise reconnect as shipped and document the gap. Rejected because the roadmap already lists it as shipped and CLAUDE.md documents it as a feature (TST-12); leaving clients unable to consume it is a latent correctness trap, not a documentation nuance.

**Implementation.**
- Test: add `GatewayEndToEndReconnectReplayTests` under `src/ZB.MOM.WW.MxGateway.Tests/Gateway/` reusing `FakeWorkerHarness` and `ManualTimeProvider` to control the detach-grace clock.
- Clients: `clients/dotnet`, `clients/go`, `clients/rust`, `clients/python`, `clients/java` event readers — expose `ReplayGap` on the stream item type. Cross-reference the clients-domain report (`CLI`) for the shared stream-surface shape.
- Docs: `docs/Sessions.md` "Reconnect and replay" — change "server-side" caveat to "supported end-to-end"; each client README documents the gap signal.

**Verification.** `dotnet test src/ZB.MOM.WW.MxGateway.Tests/ZB.MOM.WW.MxGateway.Tests.csproj --filter FullyQualifiedName~GatewayEndToEndReconnectReplayTests`; per-client build/test per CLAUDE.md's client table (`gradle test`, `cargo test --workspace`, `python -m pytest`, `go test ./...`, `dotnet build clients/dotnet/...`).

---

## TST-02 — Reconnect owner re-validation not implemented   `High` · `P0`

**Finding.** Epic Task 13 ("Owner re-validation on reconnect") is pending — verified `oldtasks.md:40` (`⏳ Task 13 (#120): Owner re-validation on reconnect — blockedBy 12, 1`). Nothing ties a resuming `StreamEvents` call to the API key that opened the session beyond possessing the `event` scope and knowing the session id.

**Impact.** With fan-out (`AllowMultipleEventSubscribers`) or detach-grace enabled, any `event`-scoped key that learns a session id can attach to another key's session and receive its replayed and live data. This is a trust-boundary hole in a window that is **on by default** (`DetachGraceSeconds = 30`). It is a security control, not a resilience nicety.

**Design.** Persist the opening key's identity on the session and enforce it on every `StreamEvents` attach/reattach. Options:
- **(recommended)** Store the authenticated key id (already available on the auth context from `GatewayGrpcAuthorizationInterceptor`) on the session record at `OpenSession`; in `EventStreamService`/`MxAccessGatewayService.StreamEvents`, reject an attach whose caller key id ≠ the session owner with `PermissionDenied`. Admin-scope override deferred to Phase 4 (TST-15).
- Rejected: gate solely on the `event` scope (status quo) — that is exactly the hole.

This is a P0 item in the roadmap ("Close the reconnect owner re-validation gap or flip retention defaults off until it lands"). If Task 13 cannot land immediately, the safe interim is to flip `DetachGraceSeconds`/fan-out defaults off and correct CLAUDE.md (TST-12) to match — but the recommended path is to implement re-validation because the feature is already documented as shipped.

**Implementation.**
- `src/ZB.MOM.WW.MxGateway.Server/Sessions/SessionManager.cs` (session record gains an owner key id) and `Sessions/GatewaySession.cs`.
- `src/ZB.MOM.WW.MxGateway.Server/Gateway/Grpc/EventStreamService.cs` / `MxAccessGatewayService.cs` — owner check on attach.
- Tests: `EventStreamServiceTests` (owner match / mismatch / admin override), plus an attach-by-foreign-key rejection case in the reconnect integration test (TST-01).
- Docs: `docs/Sessions.md` and `docs/DesignDecisions.md` — document the owner-binding rule; CLAUDE.md Authentication section note that session attach is owner-scoped.

**Verification.** `dotnet test ... --filter FullyQualifiedName~EventStreamServiceTests` and the TST-01 integration filter; `dotnet build src/ZB.MOM.WW.MxGateway.Server`.

---

## TST-03 — No CI exists   `High` · `P1`

**Finding.** No pipeline files anywhere — verified: `.github/` and `.gitea/` absent, no `*.yml`/`Jenkinsfile`/`azure-pipelines.yml` at repo root. Every documented verification step is manual.

**Impact.** The five-language, dual-runtime (net10 / net48-x86) matrix is precisely the shape that breaks silently. Repo history shows the failure class is routine: net48 CS0246 on unregenerated protos, Java tracked-generated-file churn, seven-week-stale client descriptors (cross-domain `IPC`/`CLI`).

**Design.** Stand up a minimal pipeline. Because the x86 Worker only builds on a Windows host with MXAccess installed, split into a portable job (any runner) and a Windows job (self-hosted runner on windev, `10.100.0.48`). Live-MXAccess runs stay opt-in and scheduled, never gating a push.

Minimal pipeline (Gitea Actions syntax; `.github/workflows/` is drop-in equivalent if the mirror is GitHub):

```yaml
# .gitea/workflows/ci.yml
name: ci
on: [push, pull_request]
jobs:
  portable:                       # any linux/mac runner — no MXAccess, no x86
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Build NonWindows solution
        run: dotnet build src/ZB.MOM.WW.MxGateway.NonWindows.slnx -c Release
      - name: Gateway fake-worker tests
        run: dotnet test src/ZB.MOM.WW.MxGateway.Tests/ZB.MOM.WW.MxGateway.Tests.csproj -c Release
      - name: Descriptor / codegen freshness
        run: pwsh scripts/check-descriptors.ps1   # see below; fail if regen would change tracked output
      - name: Client builds/tests
        run: |
          dotnet build clients/dotnet/ZB.MOM.WW.MxGateway.Client.slnx -c Release
          (cd clients/go && gofmt -l . && go build ./... && go test ./...)
          (cd clients/rust && cargo fmt --check && cargo test --workspace && cargo clippy --workspace --all-targets -- -D warnings)
          (cd clients/python && python -m pip install -e ".[dev]" && python -m pytest)
      - name: Java client
        run: (cd clients/java && gradle test)      # needs a JDK 17 runner; Mac dev box has none
  windows:                        # self-hosted windev runner — x86 worker + net48 tests
    runs-on: [self-hosted, windows]
    steps:
      - uses: actions/checkout@v4
      - run: dotnet build src/ZB.MOM.WW.MxGateway.Worker/ZB.MOM.WW.MxGateway.Worker.csproj -p:Platform=x86
      - run: dotnet test src/ZB.MOM.WW.MxGateway.Worker.Tests/ZB.MOM.WW.MxGateway.Worker.Tests.csproj -p:Platform=x86
  live-mxaccess:                  # scheduled only, never gates a push
    if: github.event_name == 'schedule'
    runs-on: [self-hosted, windows, mxaccess]
    env: { MXGATEWAY_RUN_LIVE_MXACCESS_TESTS: "1" }
    steps:
      - uses: actions/checkout@v4
      - run: dotnet test src/ZB.MOM.WW.MxGateway.IntegrationTests/ZB.MOM.WW.MxGateway.IntegrationTests.csproj
```

**Freshness check.** The `descriptors/codegen freshness` step is the highest-leverage single guard (it protects the Generated/-commit rule and the stale client descriptor set). Implement `scripts/check-descriptors.ps1` to: rebuild `ZB.MOM.WW.MxGateway.Contracts`, regenerate the published client descriptor set, then `git diff --exit-code` the tracked `Generated/` and `clients/proto/descriptors/` paths — non-empty diff fails the job. This addresses the `IPC` domain's stale-descriptor finding directly; coordinate the exact regen command with that report.

Note the two known-noisy interactions to encode as CI hygiene: net48 requires the regenerated `Generated/*.cs` to be **committed** (regen-then-commit), while the Java build **regenerates and dirties** `clients/java/src/main/generated/.../MxaccessGateway.java` with spurious version churn that must be reverted when no `.proto` changed. The Java job must `git checkout` that file after `gradle test` (or the freshness check must exclude it) so the build stays green.

**Implementation.** New `.gitea/workflows/ci.yml` (+ `.github/workflows/ci.yml` if mirrored); new `scripts/check-descriptors.ps1`. Register a self-hosted runner on windev with `windows`/`mxaccess` labels. Docs: add a "Continuous Integration" section to `docs/GatewayTesting.md` describing the jobs and the scheduled live cadence; note the Windows-runner requirement for the x86 worker.

**Verification.** Push a branch and confirm the `portable` and `windows` jobs go green; deliberately introduce a proto change without regen and confirm the freshness step fails.

---

## TST-04 — Session-resilience epic 16/28 tasks unfinished   `High` · `P2`

**Finding.** Verified `oldtasks.md:39-63`: pending are Task 13 (owner re-validation, TST-02), 14–15 (client ReplayGap + reconnect test, TST-01), 16–19 (per-session dashboard ACL, TST-15), and 20–28 (orphan-worker reattach, incl. the `EnableOrphanReattach` flag at Task 26 that does not yet exist). The repo advertises reconnect and fan-out as shipped while their trust boundary and client support are absent.

**Impact.** The default-on retention window has no owner check (security, TST-02); no client can consume the protocol (TST-01); Phase 5 reattach would reverse a documented CLAUDE.md invariant ("Gateway restart does not reattach orphan workers"). The epic is in a state where "shipped" and "planned" are entangled in the same docs.

**Design.** Treat the epic as three decisions, not one:
- **Phase 3 (Tasks 13–15): finish now, as one unit.** These make the already-shipped server behaviour real and safe — TST-01 + TST-02 are that work.
- **Phase 4 (Tasks 16–19): scope explicitly.** Per-session dashboard ACL is TST-15; decide the Viewer default (admin-sees-all vs strict per-session, the open decision at `oldtasks.md:52`) before implementing.
- **Phase 5 (Tasks 20–28): re-scope or defer explicitly.** Orphan-worker reattach reverses a CLAUDE.md invariant and adds a manifest store + phone-home protocol. Recommendation: mark Phase 5 as **deferred, not planned** unless a concrete requirement exists; do not leave it as implied backlog. The `EnableOrphanReattach` flag must not be referenced anywhere as if it exists until Task 26 lands.

This finding is the umbrella; TST-01/02/15 are its actionable slices. The remediation here is the governance action: update the epic's tracking source and the roadmap so "shipped" claims match reality.

**Implementation.**
- Update `docs/plans/2026-06-15-session-resilience.md.tasks.json` and its mirror `oldtasks.md` to reflect the Phase-3-finish / Phase-4-scope / Phase-5-defer decision (retire the mirror once the epic resumes or is closed, per TST-14).
- CLAUDE.md "Repository-Specific Conventions" — the reconnect/fan-out paragraph must state which parts are shipped-and-consumable vs server-only-pending-clients until TST-01 lands.

**Verification.** Documentation-only for the umbrella; the slices carry their own build/test verification (TST-01, TST-02, TST-15).

---

## TST-05 — Real-worker control/COM paths verified opt-in only   `Medium` · `P1`

> **Status revisit 2026-08-10 (unlocked by TST-25): `Partially done` — one half closed, one half open.**
>
> **Closed — the scheduled cadence.** The `nightly-windev` job in `.gitea/workflows/ci.yml` (cron `0 6 * * *`, gated `if: github.event_name == 'schedule'`) runs `scripts/ci/run-windev-ci.sh live`, which drives `scripts/ci/windev-worker-ci.ps1 -Mode live` on windev: x86 Worker build → full `Worker.Tests` → full-slnx build → `MXGATEWAY_RUN_LIVE_MXACCESS_TESTS=1 dotnet test … --filter FullyQualifiedName~WorkerLiveMxAccessSmokeTests`. A red nightly opens a Gitea issue, so nobody has to watch the Actions page. That is exactly this finding's **Design** paragraph, and it is the `live-mxaccess` job the design referred to (renamed; the removed job it originally pointed at is gone — see cycle-2 TST-25/TST-26).
>
> **Open — the coverage audit.** The design also required auditing `WorkerLiveMxAccessSmokeTests.cs` for coverage of *each* of the eleven late-added command kinds and adding missing `[LiveMxAccessFact]` cases. That audit now has an answer, and it is negative for five of the eleven. The suite's eight facts reach all six late-added **COM** commands (`Suspend`, `Activate`, `AuthenticateUser`, `ArchestrAUserToId`, `AddBufferedItem`, `SetBufferedUpdateInterval` — the `NewComCommands_RoundTripWithRealReplies` and `BufferedItem_*` facts). None of them sends any of the five **control** commands: `MxCommandKind.{Ping,GetSessionState,GetWorkerInfo,DrainEvents,ShutdownWorker}` do not appear anywhere in the file. Those are the very kinds the Finding below names as masked. The real worker answers them off-STA in `src/ZB.MOM.WW.MxGateway.Worker/Ipc/WorkerPipeSession.cs` (dispatch switch at `:574`+), so the nightly exercises that code path only incidentally, never by assertion — a regression in `CreatePingReply`/`CreateSessionStateReply`/`CreateWorkerInfoReply`/the drain snapshot/the shutdown-after-reply ordering still ships green through both CI and the nightly.
>
> **Residual work to close TST-05 fully** (small, Windows-only): add one `[LiveMxAccessFact]` to `WorkerLiveMxAccessSmokeTests` that, against a live worker, invokes `Ping` → `GetSessionState` → `GetWorkerInfo` → `DrainEvents` and asserts each returns a non-`INVALID_REQUEST` reply carrying real worker state (e.g. `worker_process_id` matching the launched process), plus a separate fact for `ShutdownWorker` asserting the OK reply arrives *before* the worker exits and the session is then faulted/closed. `ShutdownWorker` needs `admin` scope and terminates the worker, so it must be the last fact in its own fixture. Not done here because it can only be authored and verified on windev with MXAccess installed; this revisit is doc/tracker-only.

**Finding.** All eleven late-added command kinds are unit-tested against fakes and live-verified once on the dev rig (`stillpending.md` §1.1), but the default suite exercises `Ping`/`GetWorkerInfo`/`DrainEvents`/`ShutdownWorker` only through `FakeWorkerHarness.RespondToControlCommandAsync` (verify current line range in `src/ZB.MOM.WW.MxGateway.Tests/Gateway/Workers/Fakes/FakeWorkerHarness.cs`), which returns canned replies.

**Impact.** A worker-side regression in these paths is invisible until someone sets `MXGATEWAY_RUN_LIVE_MXACCESS_TESTS=1`.

**Design.** Co-designed with TST-03: schedule `WorkerLiveMxAccessSmokeTests` on the windev runner on a cadence (the `live-mxaccess` job above). No new test code needed beyond ensuring the existing live suite covers the eleven command kinds; if any are absent, add live cases. This converts "opt-in, run by memory" into "runs nightly, reports failures."

**Implementation.** Covered by the `live-mxaccess` scheduled job in TST-03. Audit `WorkerLiveMxAccessSmokeTests.cs` for coverage of each command kind; add missing `[LiveMxAccessFact]` cases. Docs: `docs/GatewayTesting.md` opt-in matrix notes the scheduled cadence.

**Verification.** On windev: `MXGATEWAY_RUN_LIVE_MXACCESS_TESTS=1 dotnet test src/ZB.MOM.WW.MxGateway.IntegrationTests/...`.

---

## TST-06 — Dashboard live-data path untested   `Medium` · `—`

**Finding.** `Dashboard/DashboardLiveDataService.cs` (verified present; owns the shared lazily-opened gateway session backing `/browse` live values) has no test class; `EventsHub`/`AlarmsHubPublisher` hub methods are likewise untested.

**Impact.** The one dashboard component that holds a real worker session and can fault it has no regression net; a fault-recovery or double-open bug ships silently.

**Design.** Add a fake-worker-backed test for the three behaviours that matter: (1) session reuse across concurrent `/browse` requests (one shared session, not one per request), (2) fault recovery — after the backing session faults, the next request re-opens rather than throwing, (3) disposal releases the session. `FakeWorkerHarness` already models faults, so no live COM needed.

**Implementation.** New `DashboardLiveDataServiceTests` under `src/ZB.MOM.WW.MxGateway.Tests/Gateway/Dashboard/`. Optionally add hub-method tests for `EventsHub`/`AlarmsHubPublisher` group join/leave. Docs: none required (internal test coverage).

**Verification.** `dotnet test ... --filter FullyQualifiedName~DashboardLiveDataServiceTests`.

---

## TST-07 — Real-clock sleeps with negative assertions are latent flakes   `Medium` · `—`

**Finding.** Verified `src/ZB.MOM.WW.MxGateway.Tests/Gateway/Workers/WorkerClientTests.cs:431` sleeps `Task.Delay(150ms)` ("give the heartbeat monitor a few real check-intervals") then asserts `client.State == Ready` (state did *not* change); `SessionManagerTests.cs:400` races a 50 ms delayed state flip against a bounded wait. (Report cited :433 and :402; the sleep is at :431 and the race setup at :400 — minor drift.) 47 `Thread.Sleep`/`Task.Delay` occurrences across 22 test files, most benign.

**Impact.** Fixed-real-time negative assertions can pass spuriously (the awaited thing hadn't happened yet anyway) or fail under CI load — corrosive in an already-manual regime, and doubly so once TST-03 runs them on shared runners.

**Design.** Convert the negative-assertion sleeps to `ManualTimeProvider`-driven check-interval pumping (advance the fake clock across the monitor's interval deterministically) or poll-until-stable with a short quiescence window. The heartbeat monitor already accepts an injected clock in production, so `WorkerClientTests` can advance it instead of sleeping. Leave the benign cancellation-bounded polls and `ManualTimeProvider` clock uses alone.

**Implementation.** `WorkerClientTests.cs` (heartbeat within-ceiling case) and `SessionManagerTests.cs` (state-flip race) — drive via the injected `TimeProvider`. Docs: none.

**Verification.** `dotnet test ... --filter FullyQualifiedName~WorkerClientTests` and `~SessionManagerTests`; run each 10× to confirm no spurious pass/fail.

---

## TST-08 — Full-suite orphaned testhost processes   `Medium` · `P1`

**Finding.** CLAUDE.md ("Source Update Workflow") documents that the full gateway suite "leaves orphaned testhost processes" and mandates filtered runs as a workaround. The workaround is procedural and is now baked into the repo's memory (`feedback_targeted_tests_only.md`).

**Impact.** Any future CI (TST-03) or an unaware contributor inherits zombie processes; the leak points at an undisposed `NamedPipeServerStream` or a hosted-service test fixture that never stops.

**Design.** Find and fix the leaking fixture rather than institutionalizing the workaround. Method: run the full suite locally, enumerate surviving `testhost`/pipe handles, bisect by test collection to the leaking fixture (prime suspects: fake-worker harness pipe servers, `SessionLeaseMonitorHostedService`/`OrphanWorkerCleanupHostedService` test hosts that start a timer but are never `StopAsync`/`Dispose`d). Ensure every `IAsyncDisposable`/`IDisposable` fixture is disposed and every started hosted service is stopped in teardown. This is prerequisite to a reliable CI full-suite run; keep the filtered-run guidance until the leak is closed.

**Implementation.** Likely `src/ZB.MOM.WW.MxGateway.Tests` fixtures under `Gateway/Workers/Fakes/` and any hosted-service test. Docs: once fixed, update CLAUDE.md "Source Update Workflow" to drop the "leaves orphaned testhost processes" rationale (keep filtered-run guidance for speed, not correctness).

**Verification.** Run the full `dotnet test src/ZB.MOM.WW.MxGateway.Tests/...` once and confirm no surviving `testhost` processes (`pgrep -f testhost` empty after exit). Note the pre-existing macOS `SessionWorkerClientFactoryFakeWorkerTests` timeout-message failures are environmental and out of scope (`project_macos_pipe_timeout_test_failures.md`).

---

## TST-09 — Health checks cover only the auth store   `Medium` · `—`

**Finding.** Verified `src/ZB.MOM.WW.MxGateway.Server/GatewayApplication.cs:71-75` registers exactly one `AuthStoreHealthCheck` tagged `Ready`. No readiness check for Galaxy SQL reachability, LDAP bind, alarm-monitor session health, or worker-executable presence/launchability — each a documented startup dependency.

**Impact.** `/health` reports Ready while the gateway cannot open a session (missing/invalid worker exe) or browse Galaxy (SQL down). Deploys look healthy and fail on first real request.

**Design.** Add tagged health checks next to the existing one, cheapest-first:
- **Worker-executable check** — reuse `WorkerExecutableValidator` (already unit-tested); pure filesystem/PE check, no side effects. Tag `Ready`.
- **Galaxy SQL** and **LDAP bind** — network checks; cache the result (e.g. 30 s) so `/health` polling doesn't hammer SQL Server / GLAuth. Tag `Ready` (or a separate `Dependencies` tag if operators want liveness vs readiness split).
- Alarm-monitor session health — expose the monitor's current state as a check if the alarm feature is enabled.

Gate the network checks behind config so a gateway with dashboard/alarms disabled doesn't fail readiness on an unconfigured dependency.

**Implementation.** `GatewayApplication.cs` health-check registration; new check classes under `src/ZB.MOM.WW.MxGateway.Server/` (e.g. `Health/WorkerExecutableHealthCheck.cs`, `Health/GalaxySqlHealthCheck.cs`, `Health/LdapHealthCheck.cs`). Tests: `...Tests/Gateway/Health/`. Docs: `docs/GatewayConfiguration.md` and `gateway.md` health section — list the checks and their tags; note the Wonder deployment exposes only `/health/live` (`project_wonder_deployment.md`) so keep a liveness-only endpoint working.

**Verification.** `dotnet build src/ZB.MOM.WW.MxGateway.Server`; unit tests for each check; manual `curl /health/ready` with a missing worker exe returns Unhealthy.

---

## TST-10 — Deployment/upgrade undocumented and hand-rolled   `Medium` · `—`

**Finding.** Deployments are NSSM-wrapped services with configuration in NSSM environment variables (acknowledged in `docs/GatewayConfiguration.md` and the project-memory deploy notes). `scripts/` has packaging and e2e scripts but no deploy/upgrade script, and no runbook for the `MxAccessGw`→`OtOpcUa` service-dependency dance.

**Impact.** Deploys are tribal knowledge (captured only in the operator's private memory files, `project_deploy_mechanics.md`); a second operator cannot reproduce a deploy or upgrade from the repo.

**Design.** Commit `docs/Deployment.md` (runbook) plus a publish/deploy script that captures the NSSM env-var configuration as code. The runbook records: framework-dependent publish command, exe layout under `C:\publish\mxaccessgw\{Server,Worker}`, the ports (5120 gRPC / 5130 dashboard), the `Stop-Service -Force` + manual `OtOpcUa` restart sequence, and the Wonder-host HTTPS/self-signed specifics. The script parameterizes host + env-var set. This is documentation/scripting only — no source change, and it must not embed secrets (LDAP service password, API keys) per CLAUDE.md.

**Implementation.** New `docs/Deployment.md`; new `scripts/deploy-gateway.ps1` (idempotent: stop, copy, apply NSSM env vars from a config file, restart, restart dependents). Reference — do not copy secrets from — the operator memory notes. Docs cross-link from `gateway.md`.

**Verification.** Dry-run the script against windev (`10.100.0.48`); confirm the service restarts and `OtOpcUa` comes back. No unit tests (ops script).

---

## TST-11 — No version discipline on server; client versions drift   `Medium` · `P2`

**Finding.** Verified: Server/Worker csproj carry no `Version` (assemblies stamp 1.0.0); Contracts is `0.1.2` (`ZB.MOM.WW.MxGateway.Contracts.csproj:10`); Python `0.1.2` (`pyproject.toml:9`), Rust `0.1.2` (`Cargo.toml:3`), Java `0.2.0` (`build.gradle:16`) — and the Java bump required a hand-maintained `CLIENT_VERSION` constant that drifted once (commit `b6a0d90`).

**Impact.** Support cannot correlate a deployed gateway or a client artifact to a commit; duplicated version constants have already drifted.

**Design.** Single-source versions:
- **.NET side:** define `<Version>`/`<InformationalVersion>` in `src/Directory.Build.props` (which already exists and enforces build policy), stamping the git SHA into the informational version. This covers Server, Worker, Contracts uniformly.
- **Clients:** generate the client version constant at build from the package manifest rather than hand-maintaining it (Java's `CLIENT_VERSION` is the proven failure). Where a build-time generation step is impractical, add the descriptor-freshness-style check (TST-03) that fails if the constant ≠ the manifest version.
- Decide one version cadence: either lockstep all five clients + contracts, or document why Java leads (JDK-17 retarget shipped as 0.2.0). Recommendation: bring Python/Rust/dotnet/contracts to 0.2.0 to converge, then move in lockstep.

**Implementation.** `src/Directory.Build.props`; `clients/java/build.gradle` (generate constant from `version`); analogous generation/check for other clients. Docs: `docs/ClientPackaging.md` and each client README note the single-sourcing. Coordinate with the `CLI` domain report on client-version surface.

**Verification.** `dotnet build src/ZB.MOM.WW.MxGateway.slnx` and confirm assembly `InformationalVersion` carries the SHA (`dotnet --info` / reflection); per-client build confirms the constant matches the manifest.

---

## TST-12 — CLAUDE.md misstates default retention behaviour   `Medium` · `P0`

**Finding.** Verified `CLAUDE.md:79` states "Default config preserves the original single-subscriber, no-retention behavior," but code defaults enable retention: `DetachGraceSeconds = 30` (`Configuration/SessionOptions.cs:46`), `ReplayBufferCapacity = 1024` (`Configuration/EventOptions.cs:21`), `ReplayRetentionSeconds = 300` (`EventOptions.cs:29`). Only `AllowMultipleEventSubscribers` defaults off.

**Impact.** An agent or operator following CLAUDE.md assumes detached sessions die immediately and nothing is buffered — the opposite of reality, and it obscures the TST-02 security window that is on by default.

**Design.** Straight documentation correction (the roadmap lists this as P0 alongside owner re-validation). Replace the sentence with an accurate one.

**Implementation.** `CLAUDE.md:79` — change:

> Default config preserves the original single-subscriber, no-retention behavior.

to:

> Default config is single-subscriber (`AllowMultipleEventSubscribers` off), but detach-grace and replay retention are **on** by default (`DetachGraceSeconds=30`, `ReplayBufferCapacity=1024`, `ReplayRetentionSeconds=300`): a detached session is retained for 30 s and recent events are buffered for reconnect.

If TST-02's interim mitigation (flip retention off) is chosen instead of implementing owner re-validation, this sentence must instead document the flipped defaults — keep the two changes in the same commit. Docs-change-in-same-commit rule applies.

**Verification.** Read-back; no build. Cross-check the reworded claim against `SessionOptions.cs`/`EventOptions.cs` defaults.

---

## TST-13 — gateway.md carries stale design-era sketches   `Medium` · `P2`

**Finding.** Verified in `gateway.md`:
- The `WorkerEnvelope` snippet (~`:291-309`) shows `uint64 correlation_id = 4` and body tags `worker_hello=10 … command=20 … fault=26` with **no** `WorkerShutdownAck`. The actual proto uses `string correlation_id = 4` and `gateway_hello = 10 … worker_command = 13 … worker_shutdown_ack = 17 … worker_fault = 20` (`src/ZB.MOM.WW.MxGateway.Contracts/Protos/mxaccess_worker.proto:24,27,30,34,37`).
- `gateway.md:738` still states the gateway "allow[s] one active client event subscriber per session, reject[s] a second subscriber" as unconditional policy — contradicted by config-gated fan-out later in the same file and by `docs/Sessions.md`.
- `gateway.md:330` includes `rpc Session(stream ClientMessage) returns (stream ServerMessage)` which was never built; the real service is unary + server-streaming only (`mxaccess_gateway.proto:18-22`, no bidi RPC).

**Impact.** gateway.md is the mandated pre-change reading; internally inconsistent load-bearing sections cost every reader a reconciliation pass and can mislead a change.

**Design.** Don't re-inline the wire types (they drift). Replace the `WorkerEnvelope` sketch with a one-line pointer to `mxaccess_worker.proto` as the source of truth. Mark the single-subscriber paragraph as the *default* mode with a pointer to the fan-out section and `docs/Sessions.md`. Label the `Session` bidi RPC explicitly as unbuilt/deferred future work (see TST-23).

**Implementation.** `gateway.md` — three edits at the cited locations. Docs-only; no source change. This is part of the roadmap's P2 documentation-drift sweep and should land with the wider sweep (cookie name, GroupToRole sample, Java 17, Grpc.md RPC table) tracked in the `SEC`/`IPC`/`CLI` domains — cross-reference so the sweep is one commit where practical.

**Verification.** Read-back against the three proto/code citations above.

---

## TST-14 — Repo-root working artifacts need triage   `Medium` · `P2`

**Finding.** Verified: `MxAccessGateway-docs-{issues,fixed,final}.md` and `MxGatewayClient-docs-{issues,fixed}.md` are **untracked** (`git status` shows them untracked; `*-docs-{issues,fixed,final}.md` are gitignored at `.gitignore:152-154`), largest 586 KB / ~15 k lines. `stillpending.md` (tracked) is a 2026-06-15 audit snapshot serving as the de-facto backlog; `oldtasks.md` (tracked) is a human-readable mirror of the epic tasks.json; `REVIEW-PROCESS.md` + `code-reviews/` is a completed review system; `A2-galaxyrepository-adoption-handoff.md` is a completed migration handoff referenced from CLAUDE.md.

**Impact.** The dead untracked `*-docs-*.md` files (15 k+ lines) trip greps and agents. The tracked snapshots blur "backlog" vs "historical record."

**Design.** Triage by evidence, not blanket deletion:
- **Delete** the five untracked `*-docs-*.md` working files — dead local outputs of a finished docs-review pass. They are gitignored, so deletion is local only.
- **`stillpending.md`:** either promote to a maintained register (drop the "Generated: … Commit:" snapshot framing) or migrate its open items (§1.3, §1.4, §3.x, epic remainder) to the Gitea tracker `docs/ImplementationPlanIndex.md` describes. Recommendation: migrate, since a tracker already exists in the plan.
- **`oldtasks.md`:** keep only until the epic resumes/closes (TST-04), then delete — it is a mirror of the tasks.json.
- **`REVIEW-PROCESS.md` + `code-reviews/`:** keep (living, self-consistent, zero open findings).
- **`A2-galaxyrepository-adoption-handoff.md`:** archive under `docs/plans/` once its cross-repo follow-ups land; update the CLAUDE.md reference if moved.

**Implementation.** `rm` the untracked files; move/rewrite `stillpending.md`; update CLAUDE.md if `A2-…` moves. No source change.

**Verification.** `git status` clean of the `*-docs-*.md` files; `grep -rn` for those filenames returns nothing.

---

## TST-15 — Dashboard EventsHub has no per-session ACL   `Medium` · `P2`

**Finding.** Verified `src/ZB.MOM.WW.MxGateway.Server/Dashboard/Hubs/EventsHub.cs:39` carries `TODO(per-session-acl)` — the only production-source TODO in the repo. Any authenticated dashboard Viewer may join any `session:{id}` group (group name built at `EventsHub.cs:21`) and observe that session's event stream.

**Impact.** Acceptable for a single-tenant dashboard; wrong the moment `GroupToRole` admits low-trust viewers. It is the dashboard-side twin of the gRPC owner-revalidation gap (TST-02).

**Design.** Fully fleshed out in `docs/plans/2026-07-10-dashboard-session-acl-tst15.md` (epic Phase 4, Tasks 16–19, TST-04). In brief: the dashboard authenticates LDAP users (Admin/Viewer) while sessions are API-key-owned (`OwnerKeyId`) — two disjoint identity domains — so the ACL needs a bridge: a **session tag** sourced from the owning API key (riding in the existing `ApiKeyConstraints` JSON blob, no SQLite migration). Admin sees all; a Viewer may `SubscribeSession` iff `session.Tags ∩ viewer.GrantedTags ≠ ∅` (granted via a new `Dashboard:GroupToTag` map, carried into the hub token as tag claims); untagged sessions are Admin-only by default. The Viewer-default decision (admin-sees-all vs strict) is settled there. Until Phase 4 lands, keep the TODO (it correctly documents the accepted single-tenant assumption); do not silently remove it.

**Implementation.** `Dashboard/Hubs/EventsHub.cs` (ACL check on group join), hub-token minting to carry the session tag, `Configuration/DashboardOptions.cs` for any group-to-tag config (Task 17). Tests: `...Tests/Gateway/Dashboard/` hub ACL cases incl. live-LDAP users (Task 19). Docs: `docs/Sessions.md`/`gateway.md` dashboard section document the ACL model; CLAUDE.md dashboard-auth paragraph.

**Verification.** `dotnet test ... --filter FullyQualifiedName~EventsHub`; `dotnet build src/ZB.MOM.WW.MxGateway.Server`.

---

## TST-16 — `Dashboard:ShowTagValues` is a dead flag   `Medium` · `—`

**Finding.** Verified bound at `Configuration/DashboardOptions.cs:62`, projected into effective config (`EffectiveDashboardConfiguration.cs:9`, `GatewayConfigurationProvider.cs:63`), and displayed read-only on the settings page (`Dashboard/Components/Pages/SettingsPage.razor:65`) — but it gates no value-display behaviour anywhere. `docs/GatewayConfiguration.md:174` calls it "Reserved". (Note `docs/GatewayDashboardDesign.md:305` claims it "continues to govern" value display — that prose is aspirational/stale.)

**Impact.** An operator toggling a flag that renders on the settings page reasonably expects an effect; there is none.

**Design.** Decide implement-or-remove. Recommendation: **implement** — the flag has an obvious intended meaning (gate live tag-value display in `/browse`, consistent with the redaction philosophy in CLAUDE.md "Don't log secrets or full tag values by default"). Wire `ShowTagValues` into `DashboardLiveDataService`/the browse value-rendering path so `false` suppresses live values. If the team prefers not to implement, remove it from the options, the projector, the settings page, and downgrade the docs row — a settings-page-visible no-op is the worse outcome. Open question: default value (currently `false`) and whether it interacts with the per-session ACL (TST-15).

**Implementation.** `Dashboard/DashboardLiveDataService.cs` + the browse value component to honour the flag (implement path); or remove from `DashboardOptions.cs:62`, `EffectiveDashboardConfiguration.cs`, `GatewayConfigurationProvider.cs`, `SettingsPage.razor` (remove path). Tests: extend the TST-06 `DashboardLiveDataServiceTests` for the flag. Docs: `docs/GatewayConfiguration.md:174` and `docs/GatewayDashboardDesign.md:305` — replace "Reserved"/stale prose with the real behaviour.

**Verification.** `dotnet build src/ZB.MOM.WW.MxGateway.Server`; test toggling the flag suppresses/shows values; docs match.

---

## TST-17 — Vendor-gated alarm parity residuals silently lossy   `Medium` · `—`

**Finding.** Verified `src/ZB.MOM.WW.MxGateway.Worker/MxAccess/WnWrapAlarmConsumer.cs:261-278`: the 8-arg `AlarmAckByName` `domain`/`full_name` fields are accepted on the wire then wrapped into the 6-arg call because the 8-arg form returns −55 on this AVEVA build (comments at `:119`, `:265-270`). `AlarmAckByGUID` is `E_NOTIMPL`. The `provider_switches` metric reason tagging has never been exercised live (`stillpending.md` §1.3–1.4, §3.4–3.5).

**Impact.** Contract fields that silently do nothing, invisible to callers — a parity gap dressed as a working feature.

**Design.** This is a genuine vendor limitation, not a bug to "fix" — per CLAUDE.md, MXAccess behaviour is the baseline and must not be papered over. The remediation is **observability, not behaviour change**: surface the drop so callers know. Add a diagnostic string to the ack reply (e.g. reply `message`/diagnostic field) noting that operator `domain`/`full_name` were not applied on this build (8-arg returns −55), and that `AlarmAckByGUID` is `E_NOTIMPL`. Do not synthesize success or invent a result — just report the degrade. Keep the TODO/comment referencing the AVEVA stub so a future runtime that implements it can drop the workaround.

**Implementation.** `Worker/MxAccess/WnWrapAlarmConsumer.cs` — populate a diagnostic in the ack reply when the 8-arg path is downgraded. Confirm the gateway forwards that diagnostic to the client reply (`Gateway/Grpc/...`). Tests: worker ack-consumer test asserting the diagnostic is present on the downgraded path (`src/ZB.MOM.WW.MxGateway.Worker.Tests`). Docs: `gateway.md`/`docs/` alarm section and the relevant client READMEs note the vendor-gated residual. Cross-reference the `WRK` domain report for the alarm-consumer specifics.

**Verification.** `dotnet build src/ZB.MOM.WW.MxGateway.Worker -p:Platform=x86`; `dotnet test src/ZB.MOM.WW.MxGateway.Worker.Tests/... -p:Platform=x86` (Windows).

---

## TST-18 — Hosted-service wrappers untested   `Low` · `—`

**Finding.** `SessionLeaseMonitorHostedService` and `OrphanWorkerCleanupHostedService` delegate to well-tested cores (sweep logic covered via `SessionManagerTests.CloseExpiredLeasesAsync` cases), but their timer/startup wiring has no direct tests.

**Impact.** Low — failure mode (a timer that never fires) is obvious at startup and in integration.

**Design.** Add a thin `StartAsync` → tick-once (via injected `TimeProvider`) → assert the core method was invoked → `StopAsync` disposes cleanly test for each. This also directly exercises the disposal path relevant to TST-08 (verify the hosted service stops its timer on `StopAsync`), so it doubles as a leak-regression guard.

**Implementation.** New small test classes under `src/ZB.MOM.WW.MxGateway.Tests/Gateway/Sessions/` and `.../Workers/`. Docs: none.

**Verification.** `dotnet test ... --filter FullyQualifiedName~HostedService`.

---

## TST-19 — Keep FakeWorkerHarness canned replies in lockstep   `Low` · `—`

**Finding.** `FakeWorkerHarness` shares `WorkerFrameReader`/`WorkerFrameWriter`/`WorkerEnvelope` with production and scripts malformed/oversized frames, heartbeats, faults, shutdown acks, and control-command reply shapes. What it cannot represent (STA pumping, COM HRESULT semantics, process exit codes, event timing under load) is honestly delegated to the live suite. History (`stillpending.md` §1.1) shows the canned replies drifted once: green fakes masked an unimplemented real worker for months.

**Impact.** Low today; the risk is future drift where fake replies stop matching `WorkerPipeSession`, hiding a real-worker regression.

**Design.** No code fix — this is a process guard. The durable protection is TST-05's scheduled live suite (it catches fake/real drift automatically) plus a code-review checklist note. Add a comment/README note in the fakes directory pointing at `WorkerPipeSession` as the reply-shape source of truth, so any control-command change updates both.

**Implementation.** `src/ZB.MOM.WW.MxGateway.Tests/Gateway/Workers/Fakes/` — add a short README or header comment. Rely on TST-05 (scheduled live) for the real guard. Docs: `docs/GatewayTesting.md` already states the fidelity charter; add the "keep in lockstep, live suite catches drift" note.

**Verification.** Covered by TST-05's scheduled live run; no standalone test.

---

## TST-20 — E2E script papers over a real advise-without-consumer sharp edge   `Low` · `—`

**Finding.** `scripts/run-client-e2e-tests.ps1` (~1,715 lines) interleaves `StreamEvents` drains every ~15 advised tags because advising without a consumer overflows the worker event channel and faults the session under `FailFast` (`docs/GatewayTesting.md` "Client E2E Scripts" phase 3).

**Impact.** Low as a test detail, but it is real product feedback: any client doing bulk-advise-then-stream will fault sessions.

**Design.** Treat as product feedback, not a script fix. The clean solution is a subscribe-time channel policy (buffer/backpressure the event channel until a subscriber attaches, or a bounded pre-subscription buffer) — but that is a cross-domain backpressure decision owned by the `IPC`/`GWC`/`WRK` reports' "coordinated size/backpressure pass" (roadmap P1 #8). This finding's action is to **record** the sharp edge as an input to that pass and, until then, document the advise-then-stream ordering requirement in the client READMEs so real clients don't fault sessions.

**Implementation.** No script change. Docs: client READMEs and `gateway.md` event section note "attach `StreamEvents` before bulk advise, or drain periodically." Cross-reference the backpressure-pass finding in the other domains.

**Verification.** Docs read-back; the behavioural fix is verified under the coordinated backpressure pass, not here.

---

## TST-21 — Log rotation configured but minimal   `Low` · `—`

**Finding.** Verified `src/ZB.MOM.WW.MxGateway.Server/appsettings.json:8-11` rolls the Serilog file sink daily (`logs/mxgateway-.log`, relative to the service working directory) with no `retainedFileCountLimit` or size cap (Serilog defaults: 31 files, unbounded size per day).

**Impact.** Acceptable, but a high-rate event day can produce an unbounded single file, and a relative path lands logs in the service CWD.

**Design.** Set `fileSizeLimitBytes` + `rollOnFileSizeLimit: true` and an absolute log path for the deployed service. Keep it in the deployment config (NSSM env-var overlay / deploy script from TST-10) rather than only in the committed `appsettings.json`, since the absolute path is host-specific.

**Implementation.** `src/ZB.MOM.WW.MxGateway.Server/appsettings.json` Serilog file sink (add size cap + retained-count) and the TST-10 deploy config for the absolute path. Docs: `docs/GatewayConfiguration.md` logging notes; `docs/Deployment.md`.

**Verification.** `dotnet run --project src/ZB.MOM.WW.MxGateway.Server/...` and confirm rollover on size; no unit test.

---

## TST-22 — Config-shape JSON block omits documented keys   `Low` · `—`

**Finding.** Verified the Configuration Shape JSON block (`docs/GatewayConfiguration.md:12-83`) omits `DisableLogin`/`AutoLoginUser`/`CookieName`, the `Tls` block, and the `Alarms:Fallback` block — all of which the tables below it document. (The rest of `docs/GatewayConfiguration.md` is current: table defaults match `Configuration/*.cs`.)

**Impact.** Low — the tables are authoritative and correct; the shape block is a convenience that is now incomplete, so a copy-paste starting config misses those keys.

**Design.** Add the missing keys to the JSON block so it round-trips with the tables. Pure documentation.

**Implementation.** `docs/GatewayConfiguration.md:12-83` — add `Dashboard:DisableLogin`, `Dashboard:AutoLoginUser`, `Dashboard:CookieName`, the `Tls` section, and `Alarms:Fallback`. Verify against `Configuration/DashboardOptions.cs`, `TlsOptions.cs`, and the alarms fallback options.

**Verification.** Read-back against the cited options classes.

---

## TST-23 — Bidirectional `Session` RPC never built   `Low` · `P2`

**Finding.** Verified `gateway.md:330` presents `rpc Session(stream ClientMessage) returns (stream ServerMessage)` as the "best long-term shape"; the shipped service stopped at unary + server-streaming (`mxaccess_gateway.proto:18-22`, no bidi RPC).

**Impact.** None functional — purely a docs-currency/roadmap-clarity issue (the twin of TST-13).

**Design.** Fold into the TST-13 gateway.md edit: label the `Session` RPC explicitly as unbuilt future work (or remove it if it is no longer the intended direction). Decide whether bidi `Session` is still on the roadmap; if not, drop the "best long-term shape" framing so it doesn't read as an imminent deliverable.

**Implementation.** `gateway.md` around `:328-345` — one clarifying edit, made with TST-13. Docs-only.

**Verification.** Read-back; consistent with `mxaccess_gateway.proto`.

---

## TST-24 — Client wire behaviour has no automated verification   `Low` · `—`

> **Resolution 2026-08-10 (branch `feat/tst-24-client-wire-tests`): `Done`.** All five clients now drive their public API against a fake gateway served over a real gRPC transport, in the client's own default suite, and all five run in CI.
>
> **Corrected premise.** The Finding's "no in-process gateway integration tests" was already stale when it was re-verified: **Go, Rust, and Java had real-server wire tests**, not mocks — Go's `newBufconnClient`/`fakeGatewayServer` (`clients/go/mxgateway/client_session_test.go`) over `grpc/test/bufconn`, Rust's `spawn_fake_gateway` (`clients/rust/tests/client_behavior.rs`) over a loopback `TcpListener` with tonic's `Server`, and Java's `InProcessGateway`/`TestGatewayService` (`MxGatewayClientSessionTests.java`) over `InProcessServerBuilder`. Each already asserted the round trip, the `authorization` bearer header as *observed by the server*, and the `ReplayGap` sentinel. The cycle-2 re-verification cited `clients/python/tests/test_replay_gap.py` as evidence for "the other four clients still unit-test against mocks"; that generalized from Python to Go/Rust/Java incorrectly. `InProcessGatewayHarness` (the "template" the Impact paragraph names) is in fact the *thinner* of the Java harnesses — it serves only `streamEvents`/`closeSession` for the CLI tests.
>
> **Real gap, and what was built.** Two clients genuinely had none. **.NET** substituted `FakeGatewayTransport` for `IMxGatewayClientTransport` in every test, so not even the generated stub ran, and its test project had no server package at all. **Python** monkeypatched `MxAccessGatewayStub` everywhere except one opt-in TLS test that served only `OpenSession`. Both now have the pattern:
> - `clients/dotnet/ZB.MOM.WW.MxGateway.Client.Tests/WireFakeGatewayServer.cs` + `MxGatewayClientWireTests.cs` — Kestrel h2c on `127.0.0.1:0` serving `MxAccessGateway.MxAccessGatewayBase`; needed new `Grpc.AspNetCore.Server` + `Microsoft.AspNetCore.App` references on the test project.
> - `clients/python/tests/test_wire_fake_gateway.py` — a `grpc.aio` server on `127.0.0.1:0` serving `MxAccessGatewayServicer`; no new dependencies (`grpcio` is a runtime dep).
>
> Each covers the four shapes the Design asked for: round trip (`OpenSession` → `Invoke`/`Register` → `StreamEvents` → `CloseSession` with every reply field asserted), the bearer header as received by the server on the streaming RPC as well as the unary ones, the `ReplayGap` sentinel surfaced as the client's typed signal (TST-01), and a real `PERMISSION_DENIED` mapping to the typed authorization error.
>
> **CI.** The `portable` job previously only *built* the .NET client; a `dotnet test` step was added, so its wire tests actually run. Go/Rust/Python already ran their suites there and Java in the `java` job.
>
> **Bug this immediately caught** — the justification for the whole finding. `GatewayClient.connect()` / `GalaxyRepositoryClient.connect()` in the Python client were **broken for every real (non-stub) connection**: they built the `grpc.aio` channel inside `asyncio.to_thread`, and a `grpc.aio` channel binds to the event loop current on the constructing thread, so the worker thread raised `RuntimeError: There is no current event loop in thread 'asyncio_0'`. No mock-based test could see it — the one test asserting the off-loop behaviour (`Client.Python-028`) monkeypatched `create_channel` and therefore asserted the bug. Fixed by splitting `resolve_channel_security` (blocking TOFU probe, runs off-loop) from `create_channel` (must run on the loop thread), keeping the Client.Python-028 guarantee; the two `-028` tests were retargeted to assert both halves.
>
> **Deliberately out of scope.** Only the four session RPCs are served — the alarm feed (`StreamAlarms`, `QueryActiveAlarms`, `AcknowledgeAlarm`) and Galaxy browse are not, matching the Design's "full parity is out of scope". Java's `InProcessGatewayHarness` still lacks `openSession`/`invoke`; the client-module tests cover those shapes, so it was left alone.
>
> **Docs.** `docs/GatewayTesting.md` § Client Wire Tests (the cross-client pattern + per-client harness table), `clients/dotnet/README.md`, `clients/python/README.md`.

**Finding.** All five clients have unit tests (13/8/3/13/7 files for dotnet/go/rust/python/java) but no in-process or containerized gateway integration tests; the only cross-language verification is the operator-run `scripts/run-client-e2e-tests.ps1`. `CrossLanguageSmokeMatrixTests` checks shapes only.

**Impact.** Low-to-moderate: a gateway contract change can pass every default suite and break all five clients (partly mitigated by shared-proto codegen). The Java CLI already proves the cheap pattern — `InProcessGatewayHarness` (`stillpending.md` §8).

**Design.** Replicate the in-process fake-gateway pattern per client so each client's happy path (open → invoke → stream) runs against a lightweight fake gateway in the client's own test suite, wired into CI (TST-03). Java has the template; port the idea to the other four. This is the cheapest way to catch contract breaks without a live rig. Full parity is out of scope — target the core session/invoke/stream shapes and the `ReplayGap` handling added in TST-01.

**Implementation.** Per-client test harness (e.g. an in-process gRPC server serving canned replies) under each `clients/<lang>/` test tree; add to the CI client jobs. Coordinate the fake-gateway contract with the `CLI` domain report. Docs: each client README notes the harness.

**Verification.** Per-client test command (CLAUDE.md client table); the harness tests run inside CI (TST-03).
