fix(driver-focas): resolve High code-review findings (Driver.FOCAS-001, Driver.FOCAS-002)

Driver.FOCAS-001: FocasDriverConfigDto exposed no FixedTree / AlarmProjection /
HandleRecycle sections, so a deployment that opted into those features per
docs/drivers/FOCAS.md had the sections silently dropped by case-insensitive
JSON parsing and the features stayed at their disabled defaults. Added
FocasFixedTreeDto / FocasAlarmProjectionDto / FocasHandleRecycleDto and Build*
mappers in CreateInstance that populate the matching FocasDriverOptions
properties; a missing section or field keeps its existing default.

Driver.FOCAS-002: the fixed-tree bootstrap probe classified ProgramInfo as
"supported" whenever GetProgramInfoAsync returned non-null, but WireFocasClient
.GetProgramInfoAsync substituted defaults instead of throwing on a FOCAS error
return, so a CNC series answering EW_FUNC/EW_NOOPT for cnc_exeprgname2 /
cnc_rdopmode still got the Program/ and OperationMode/ subtrees. The method now
throws InvalidOperationException when neither the program-name nor the op-mode
read is IsOk, so SafeTryProbe correctly suppresses the capability.

Added FocasFactoryConfigTests covering the three opt-in config sections
round-tripping through CreateInstance and the fixed-tree bootstrap classifying
ProgramInfo as unsupported when the probe throws. Added an internal
FocasDriver.Options test seam.

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

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS/FocasDriver.cs

@@ -161,6 +161,9 @@ public sealed class FocasDriver : IDriver, IReadable, IWritable, ITagDiscovery,
     internal DeviceState? GetDeviceState(string hostAddress) =>
         _devices.TryGetValue(hostAddress, out var s) ? s : null;
 
+    /// <summary>Test seam — the resolved options the factory built this driver from.</summary>
+    internal FocasDriverOptions Options => _options;
+
     // ---- IReadable ----
 
     public async Task<IReadOnlyList<DataValueSnapshot>> ReadAsync(