docs(focas): record the wire decode corrections ported from the ignitionoee driver

FOCAS.md: positions scale from each block's own base/exponent and
PositionDecimalPlaces is only the scale-less fallback; cnc_getfigure is gone;
Spindle Load/MotorSpeedPct are Float64 percentages (MaxRpm renamed); program
fields the CNC does not report read BadNoData; the #548 Makino 'AA' duplicates
were a 2-byte name decode (now AA6/AA7). New 'Wire decode corrections (2026-10)'
table lists each before/after with client-visible changes flagged, plus what
was deliberately not ported and why. Troubleshooting rows for BadNoData and
integer-macro BadTypeMismatch. Test-fixture doc follows the mock changes.

docs/drivers/FOCAS-Test-Fixture.md

@@ -61,16 +61,21 @@ binary PDUs against the documented command IDs. Covered assertions:
 
 - Session open / close (`cnc_allclibhndl3` + `cnc_freelibhndl`)
 - Parameter read-back after `mock_patch` seed → `cnc_rdparam`
-- Macro read-back after seed → `cnc_rdmacro` (scaled-decimal
-  translation verified)
+- Macro read-back after seed → `cnc_rdmacro` (8-byte ODBM shape:
+  9-digit mantissa, `dec_val` at offset 6; vacant / fractional-on-integer
+  macros read Bad)
 - PMC range read after seed → `pmc_rdpmcrng`
 - `IAlarmSource` raise + clear transitions after `mock_patch`
   alarm-list changes → `cnc_rdalmmsg2`
 - Fixed-tree bootstrap: identity / axes / spindle / program / timers /
   servo meters populate via `cnc_sysinfo`, `cnc_rdaxisname`,
   `cnc_rdspdlname`, `cnc_rddynamic2`, `cnc_exeprgname2`,
-  `cnc_rdblkcount`, `cnc_rdopmode`, `cnc_rdsvmeter`, `cnc_rdspload`,
-  `cnc_rdspmaxrpm`, `cnc_rdtimer`
+  `cnc_rdblkcount`, `cnc_rdopmode`, `cnc_rdsvmeter`, `cnc_rdspmeter`
+  (load + motor speed, 1/16384 of full scale), `cnc_rdtimer`; positions
+  scale from each `cnc_rddynamic2` block's own base/exponent (the mock
+  refuses the non-existent `cnc_getfigure` 0x00D3, as a real 31i-B does).
+  The vendored mock's local divergence from upstream is listed in
+  `Docker/focas-mock/VENDORED.md`.
 - Per-series profile selection via `mock_load_profile` — tests can
   pin one profile and assert series-gated capability suppression