Recover stashed driver-gaps work from pre-v2-mxgw-merge working tree

Captures uncommitted work that lived in the working tree on
v2-mxgw-integration but was orthogonal to the migration. Stashed
during the v2-mxgw merge to master (2026-04-30) and replanted here on
a feature branch off master so it's git-visible rather than living in
the stash list.

Two distinct buckets:

1. Tracked fixture/config refinements (10 files, ~36 lines):
   - scripts/e2e/test-opcuaclient.ps1
   - src/ZB.MOM.WW.OtOpcUa.Admin/appsettings.json
   - 5 docker-compose.yml under tests/.../IntegrationTests/Docker/
     (AbCip, Modbus, OpcUaClient, S7)
   - 4 fixture .cs files (AbServerFixture, ModbusSimulatorFixture,
     OpcPlcFixture, Snap7ServerFixture)

2. Untracked driver-gaps queue artifacts (~8000 lines):
   - docs/plans/{abcip,ablegacy,focas,opcuaclient,s7,twincat}-plan.md
     — per-driver gap plans
   - docs/featuregaps.md — cross-cutting analysis
   - docs/v2/focas-deployment.md, docs/v2/implementation/focas-simulator-plan.md
   - followup.md — auto/driver-gaps queue follow-ups
   - scripts/queue/ — PR-queue automation tooling (12 files including
     pr-manifest.yaml at 1473 lines)

This commit is a snapshot for recoverability — review and split into
focused PRs (or discard) before merging anywhere downstream.

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

tests/ZB.MOM.WW.OtOpcUa.Driver.S7.IntegrationTests/Docker/docker-compose.yml

@@ -14,6 +14,8 @@ services:
       dockerfile: Dockerfile
     image: otopcua-python-snap7:1.0
     container_name: otopcua-python-snap7-s7_1500
+    labels:
+      project: lmxopcua
     restart: "no"
     ports:
       - "1102:1102"

tests/ZB.MOM.WW.OtOpcUa.Driver.S7.IntegrationTests/Snap7ServerFixture.cs

@@ -5,7 +5,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.S7.IntegrationTests;
 /// <summary>
 ///     Reachability probe for the python-snap7 simulator Docker container (see
 ///     <c>Docker/docker-compose.yml</c>) or a real S7 PLC. Parses <c>S7_SIM_ENDPOINT</c>
-///     (default <c>localhost:1102</c>) + TCP-connects once at fixture construction.
+///     (default <c>10.100.0.35:1102</c>) + TCP-connects once at fixture construction.
 ///     Tests check <see cref="SkipReason"/> + call <c>Assert.Skip</c> when unreachable, so
 ///     `dotnet test` stays green on a fresh box without the simulator installed —
 ///     mirrors the <c>ModbusSimulatorFixture</c> pattern.
@@ -35,7 +35,7 @@ public sealed class Snap7ServerFixture : IAsyncDisposable
 {
     // Default 1102 (non-privileged) matches Docker/server.py. Override with
     // S7_SIM_ENDPOINT to point at a real PLC on its native 102.
-    private const string DefaultEndpoint = "localhost:1102";
+    private const string DefaultEndpoint = "10.100.0.35:1102";
     private const string EndpointEnvVar = "S7_SIM_ENDPOINT";
 
     public string Host { get; }