CAM: Convert tapping operation to experimental feature, Add tap pitch support, improve tapping logic, and update toolbit schema and legacy linuxcnc post

CAM/App/PathSegmentWalker.cpp
- Add G74 to drill/tap/bore G-code recognition for tapping cycles

CAM/InitGui.py
- Move CAM_Tapping command behind experimental feature flag
- Only group drilling/tapping commands if both are enabled

CAM/Path/Base/Generator/tapping.py
- Add pitch and spindle_speed parameters to tapping.generate
- Output S (spindle speed) and F (pitch) in generated G-code

CAM/Path/Op/Tapping.py
- Require Pitch property for tap tools and SpindleSpeed for tool controllers
- Pass pitch and spindle speed to tapping.generate
- Use SpindleDirection to determine right/left hand tap

CAM/Path/Post/scripts/linuxcnc_post.py
- Handle G84/G74 tapping cycles: convert pitch and spindle speed to feed rate
- Remove F and S from output and recalculate F as needed

CAM/Path/Tool/shape/models/tap.py
- Add Pitch property to ToolBitShapeTap schema
- CAM/Path/Tool/toolbit/models/tap.py
- Show pitch and rotation in tap tool summary
- Use is_imperial_pitch to format pitch as TPI or mm

CAM/Path/Tool/toolbit/util.py
- Add is_imperial_pitch utility to classify pitch as imperial or metric

CAM/Tools/Bit/375-16_Tap.fctb
- Remove unused parameters (Coating, Rotation, TPI, Type)
- Keep only relevant tap parameters for new schema

src/Mod/CAM/InitGui.py

@@ -148,7 +148,7 @@ class CAMWorkbench(Workbench):
         ]
         threedopcmdlist = ["CAM_Pocket3D"]
         engravecmdlist = ["CAM_Engrave", "CAM_Deburr", "CAM_Vcarve"]
-        drillingcmdlist = ["CAM_Drilling", "CAM_Tapping"]
+        drillingcmdlist = ["CAM_Drilling"]
         modcmdlist = ["CAM_OperationCopy", "CAM_Array", "CAM_SimpleCopy"]
         dressupcmdlist = [
             "CAM_DressupArray",
@@ -175,14 +175,21 @@ class CAMWorkbench(Workbench):
                 QT_TRANSLATE_NOOP("CAM_EngraveTools", "Engraving Operations"),
             ),
         )
-        drillingcmdgroup = ["CAM_DrillingTools"]
-        FreeCADGui.addCommand(
-            "CAM_DrillingTools",
-            PathCommandGroup(
-                drillingcmdlist,
-                QT_TRANSLATE_NOOP("CAM_DrillingTools", "Drilling Operations"),
-            ),
-        )
+        if Path.Preferences.experimentalFeaturesEnabled():
+            drillingcmdlist.append("CAM_Tapping")
+
+        if set(["CAM_Drilling", "CAM_Tapping"]).issubset(drillingcmdlist):
+            drillingcmdgroup = ["CAM_DrillingTools"]
+            FreeCADGui.addCommand(
+                "CAM_DrillingTools",
+                PathCommandGroup(
+                    drillingcmdlist,
+                    QT_TRANSLATE_NOOP("CAM_DrillingTools", "Drilling Operations"),
+                ),
+            )
+        else:
+            drillingcmdgroup = drillingcmdlist
+
         dressupcmdgroup = ["CAM_DressupTools"]
         FreeCADGui.addCommand(
             "CAM_DressupTools",