chore: organize solution into module folders (Core/Server/Drivers/Client/Tooling)

Group all 69 projects into category subfolders under src/ and tests/ so the
Rider Solution Explorer mirrors the module structure. Folders: Core, Server,
Drivers (with a nested Driver CLIs subfolder), Client, Tooling.

- Move every project folder on disk with git mv (history preserved as renames).
- Recompute relative paths in 57 .csproj files: cross-category ProjectReferences,
  the lib/ HintPath+None refs in Driver.Historian.Wonderware, and the external
  mxaccessgw refs in Driver.Galaxy and its test project.
- Rebuild ZB.MOM.WW.OtOpcUa.slnx with nested solution folders.
- Re-prefix project paths in functional scripts (e2e, compliance, smoke SQL,
  integration, install).

Build green (0 errors); unit tests pass. Docs left for a separate pass.

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

src/Server/ZB.MOM.WW.OtOpcUa.Admin/Services/ScriptTestHarnessService.cs

@@ -0,0 +1,121 @@
+using Serilog;  // resolves Serilog.ILogger explicitly in signatures
+using Serilog.Core;
+using Serilog.Events;
+using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
+using ZB.MOM.WW.OtOpcUa.Core.Scripting;
+
+namespace ZB.MOM.WW.OtOpcUa.Admin.Services;
+
+/// <summary>
+///     Dry-run harness for the Phase 7 scripting UI. Takes a script + a synthetic input
+///     map + evaluates once, returns the output (or rejection / exception) plus any
+///     logger emissions the script produced. Per Phase 7 plan decision #22: only inputs
+///     the <see cref="DependencyExtractor"/> identified can be supplied, so a dependency
+///     the harness can't prove statically surfaces as a harness error, not a runtime
+///     surprise later.
+/// </summary>
+public sealed class ScriptTestHarnessService
+{
+    /// <summary>
+    ///     Evaluate <paramref name="source"/> as a virtual-tag script (return value is the
+    ///     tag's new value). <paramref name="inputs"/> supplies synthetic
+    ///     <see cref="DataValueSnapshot"/>s for every path the extractor found.
+    /// </summary>
+    public async Task<ScriptTestResult> RunVirtualTagAsync(
+        string source, IDictionary<string, DataValueSnapshot> inputs, CancellationToken ct)
+    {
+        var deps = DependencyExtractor.Extract(source);
+        if (!deps.IsValid)
+            return ScriptTestResult.DependencyRejections(deps.Rejections);
+
+        var missing = deps.Reads.Where(r => !inputs.ContainsKey(r)).ToArray();
+        if (missing.Length > 0)
+            return ScriptTestResult.MissingInputs(missing);
+
+        var extra = inputs.Keys.Where(k => !deps.Reads.Contains(k)).ToArray();
+        if (extra.Length > 0)
+            return ScriptTestResult.UnknownInputs(extra);
+
+        ScriptEvaluator<HarnessVirtualTagContext, object?> evaluator;
+        try
+        {
+            evaluator = ScriptEvaluator<HarnessVirtualTagContext, object?>.Compile(source);
+        }
+        catch (Exception compileEx)
+        {
+            return ScriptTestResult.Threw(compileEx.Message, []);
+        }
+        var capturing = new CapturingSink();
+        var logger = new LoggerConfiguration().MinimumLevel.Verbose().WriteTo.Sink(capturing).CreateLogger();
+        var ctx = new HarnessVirtualTagContext(inputs, logger);
+
+        try
+        {
+            var result = await evaluator.RunAsync(ctx, ct);
+            return ScriptTestResult.Ok(result, ctx.Writes, capturing.Events);
+        }
+        catch (Exception ex)
+        {
+            return ScriptTestResult.Threw(ex.Message, capturing.Events);
+        }
+    }
+
+    // Public so Roslyn's script compilation can reference the context type through the
+    // ScriptGlobals<T> surface. The harness instantiates this directly; operators never see it.
+    public sealed class HarnessVirtualTagContext(
+        IDictionary<string, DataValueSnapshot> inputs, Serilog.ILogger logger) : ScriptContext
+    {
+        public Dictionary<string, object?> Writes { get; } = [];
+        public override DataValueSnapshot GetTag(string path) =>
+            inputs.TryGetValue(path, out var v)
+                ? v
+                : new DataValueSnapshot(null, Ua.StatusCodes.BadNotFound, null, DateTime.UtcNow);
+        public override void SetVirtualTag(string path, object? value) => Writes[path] = value;
+        public override DateTime Now => DateTime.UtcNow;
+        public override Serilog.ILogger Logger => logger;
+    }
+
+    private sealed class CapturingSink : ILogEventSink
+    {
+        public List<LogEvent> Events { get; } = [];
+        public void Emit(LogEvent e) => Events.Add(e);
+    }
+}
+
+/// <summary>Harness outcome: outputs, write-set, logger events, or a rejection/throw reason.</summary>
+public sealed record ScriptTestResult(
+    ScriptTestOutcome Outcome,
+    object? Output,
+    IReadOnlyDictionary<string, object?> Writes,
+    IReadOnlyList<LogEvent> LogEvents,
+    IReadOnlyList<string> Errors)
+{
+    public static ScriptTestResult Ok(object? output, IReadOnlyDictionary<string, object?> writes, IReadOnlyList<LogEvent> logs) =>
+        new(ScriptTestOutcome.Success, output, writes, logs, []);
+    public static ScriptTestResult Threw(string reason, IReadOnlyList<LogEvent> logs) =>
+        new(ScriptTestOutcome.Threw, null, new Dictionary<string, object?>(), logs, [reason]);
+    public static ScriptTestResult DependencyRejections(IReadOnlyList<DependencyRejection> rejs) =>
+        new(ScriptTestOutcome.DependencyRejected, null, new Dictionary<string, object?>(), [],
+            rejs.Select(r => r.Message).ToArray());
+    public static ScriptTestResult MissingInputs(string[] paths) =>
+        new(ScriptTestOutcome.MissingInputs, null, new Dictionary<string, object?>(), [],
+            paths.Select(p => $"Missing synthetic input: {p}").ToArray());
+    public static ScriptTestResult UnknownInputs(string[] paths) =>
+        new(ScriptTestOutcome.UnknownInputs, null, new Dictionary<string, object?>(), [],
+            paths.Select(p => $"Input '{p}' is not referenced by the script — remove it").ToArray());
+}
+
+public enum ScriptTestOutcome
+{
+    Success,
+    Threw,
+    DependencyRejected,
+    MissingInputs,
+    UnknownInputs,
+}
+
+file static class Ua
+{
+    // Mirrors OPC UA StatusCodes.BadNotFound without pulling the OPC stack into Admin.
+    public static class StatusCodes { public const uint BadNotFound = 0x803E0000; }
+}