feat(heidenhain): native read-only LSV2 driver + in-process simulator (#803)

Native LSV2 TCP transport (default port 19000; no Java/Python/vendor SDK), ported from
the ignitionoee v0.20.3 reference driver:

- Lsv2ReadOnlyPolicy: payload-aware outbound allowlist (A_LG INSPECT/DNC/DATA, R_VR, R_PR,
  R_RI 22-28/30-34/51, bounded R_MB, R_DP), applied in Lsv2Codec.Frame before any byte is
  written; no public raw-command API.
- Lsv2Client: serialized transactions, one monotonic deadline per transaction, EOF/oversize/
  unexpected/trickle close the client; Close never waits on the gate.
- Lsv2Data / HeidenhainBindingCodec: reference decoders, R_PR byte-capacity + element-index
  rules, next-area cap, DATA Boolean 00/01/FF, strict non-truncating coercion.
- HeidenhainSession: per-batch wire cache, refusal suppression, provisional DNC denial retry,
  alarm cursor (57 = end, overflow = BadOutOfRange), capability strings.
- HeidenhainDeviceRuntime: one loop per control, generation-guarded publication, all-node
  BadNoCommunication on comms loss, bounded exponential reconnect.
- HeidenhainDriver: cached ReadAsync, push subscriptions deduped on (value,status), static
  catalog discovery (no connect), host status, diagnostics, skipped-tag report. No IWritable.
- Probe (INSPECT login + version) and factory registered in DriverFactoryBootstrap (probe on
  admin nodes too); DriverTypeNames.Heidenhain.

Tests: 159 unit tests against an in-process LSV2 simulator incl. the Java fixtures' captured
iTNC 530 replies as golden vectors; env-gated LiveIntegration category for real hardware.

src/Core/ZB.MOM.WW.OtOpcUa.Core.Abstractions/DriverTypeNames.cs

@@ -62,6 +62,9 @@ public static class DriverTypeNames
     /// opt-in observation write-back via the Agent's AllowPut POST surface.</summary>
     public const string MTConnect = "MTConnect";
 
+    /// <summary>Heidenhain LSV2 CNC driver — native, read-only (logins + read requests only) over TCP 19000.</summary>
+    public const string Heidenhain = "Heidenhain";
+
     /// <summary>
     ///     Every driver-type string declared above, for callers that need to enumerate
     ///     the full set (e.g. validation of an authored <c>DriverType</c>).
@@ -80,5 +83,6 @@ public static class DriverTypeNames
         Sql,
         Mqtt,
         MTConnect,
+        Heidenhain,
     ];
 }