fix(focas): scale positions from each cnc_rddynamic2 block; delete the fabricated cnc_getfigure

Every 0x0026 position block is self-describing: [i32 raw][u16 base][u16 exponent],
value = raw / base^exponent. The live 31i-B capture (ref-dynamic2-axis1.bin)
reports base 10 / exponent 4 on every block, so axis 1 is 280.1574 mm, not
2801574. The driver ignored the envelope and instead sent 'cnc_getfigure'
(0x00D3) -- a command that does not exist in the FOCAS wire protocol, served only
by the in-tree mock; the real control refuses it with rc=1, so on hardware every
position fell back to PositionDecimalPlaces (default 0) and published raw counts.

- ParsePositionBlock decodes the envelope into FocasPosition; the driver applies
  raw / base^exponent at publish. PositionDecimalPlaces is now only the fallback
  for a scale-less (4-byte) block.
- A block describing no position (0xFFFF vacant marker, base not 2/10, exponent
  > 18 -- raw / 10^400 would read as a Good 0.0) publishes BadNoData on that node
  alone; siblings are untouched.
- ReadPositionFiguresAsync / IFocasClient.GetPositionFiguresAsync and the
  per-axis figure cache are deleted.

Ported from the sister ignitionoee FOCAS driver v0.17.0 (+ Focas.Wire-014);
live axis-scoped captures live-dynamic2-axis{1,2}-0x0026.bin (Z-34184 X 0.0374,
Y 370.177) added as fixtures.

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS.Contracts/FocasDriverOptions.cs

@@ -132,12 +132,11 @@ public sealed class FocasAlarmProjectionOptions
 ///     default) to skip range validation and preserve legacy behaviour.
 /// </param>
 /// <param name="PositionDecimalPlaces">
-///     Axis positions returned by <c>cnc_rddynamic2</c> are scaled integers. The driver
-///     divides AbsolutePosition / MachinePosition / RelativePosition / DistanceToGo by
-///     <c>10^PositionDecimalPlaces</c> at the publish seam so they surface in engineering
-///     units on the Float64 axis nodes. Default <c>0</c> (no scaling) is byte-identical to
-///     legacy behaviour. Auto-fetching this via <c>cnc_getfigure</c> is deferred (wire-gated),
-///     so it is config-supplied. Negative values are clamped to 0 (no scaling).
+///     <b>Fallback only.</b> A real CNC's <c>cnc_rddynamic2</c> position block carries its own
+///     scale (<c>raw / base^exponent</c>), which the driver always applies and which wins over
+///     this setting. Only a block that carries no scale (a 4-byte payload, e.g. an older
+///     simulator) is divided by <c>10^PositionDecimalPlaces</c>. Default <c>0</c> (no scaling).
+///     Negative values are clamped to 0.
 /// </param>
 public sealed record FocasDeviceOptions(
     string HostAddress,