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/Core/ZB.MOM.WW.OtOpcUa.Core.ScriptedAlarms/AlarmPredicateContext.cs

@@ -0,0 +1,55 @@
+using Serilog;
+using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
+using ZB.MOM.WW.OtOpcUa.Core.Scripting;
+
+namespace ZB.MOM.WW.OtOpcUa.Core.ScriptedAlarms;
+
+/// <summary>
+///     <see cref="ScriptContext"/> subclass for alarm predicate evaluation. Reads from
+///     the engine's shared tag cache (driver + virtual tags), writes are rejected —
+///     predicates must be side-effect free so their output doesn't depend on evaluation
+///     order or drive cascade behavior.
+/// </summary>
+/// <remarks>
+///     Per Phase 7 plan Shape A decision, alarm scripts are one-script-per-alarm
+///     returning <c>bool</c>. They read any tag they want but should not write
+///     anything (the owning alarm's state is tracked by the engine, not the script).
+/// </remarks>
+public sealed class AlarmPredicateContext : ScriptContext
+{
+    private readonly IReadOnlyDictionary<string, DataValueSnapshot> _readCache;
+    private readonly Func<DateTime> _clock;
+
+    public AlarmPredicateContext(
+        IReadOnlyDictionary<string, DataValueSnapshot> readCache,
+        ILogger logger,
+        Func<DateTime>? clock = null)
+    {
+        _readCache = readCache ?? throw new ArgumentNullException(nameof(readCache));
+        Logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        _clock = clock ?? (() => DateTime.UtcNow);
+    }
+
+    public override DataValueSnapshot GetTag(string path)
+    {
+        if (string.IsNullOrWhiteSpace(path))
+            return new DataValueSnapshot(null, 0x80340000u, null, _clock());
+        return _readCache.TryGetValue(path, out var v)
+            ? v
+            : new DataValueSnapshot(null, 0x80340000u, null, _clock());
+    }
+
+    public override void SetVirtualTag(string path, object? value)
+    {
+        // Predicates must be pure — writing from an alarm script couples alarm state to
+        // virtual-tag state in a way that's near-impossible to reason about. Rejected
+        // at runtime with a clear message; operators see it in the scripts-*.log.
+        throw new InvalidOperationException(
+            "Alarm predicate scripts cannot write to virtual tags. Move the write logic " +
+            "into a virtual tag whose value the alarm predicate then reads.");
+    }
+
+    public override DateTime Now => _clock();
+
+    public override ILogger Logger { get; }
+}