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/Path/Base/Generator/tapping.py

@@ -38,7 +38,15 @@ else:
     Path.Log.setLevel(Path.Log.Level.INFO, Path.Log.thisModule())
 
 
-def generate(edge, dwelltime=0.0, repeat=1, retractheight=None, righthand=True):
+def generate(
+    edge,
+    dwelltime=0.0,
+    repeat=1,
+    retractheight=None,
+    righthand=True,
+    pitch=None,
+    spindle_speed=None,
+):
     """
     Generates Gcode for tapping a single hole.
 
@@ -90,6 +98,8 @@ def generate(edge, dwelltime=0.0, repeat=1, retractheight=None, righthand=True):
     cmdParams["Y"] = startPoint.y
     cmdParams["Z"] = endPoint.z
     cmdParams["R"] = retractheight if retractheight is not None else startPoint.z
+    cmdParams["S"] = spindle_speed if spindle_speed is not None else 1.0  # Sanity default
+    cmdParams["F"] = float(pitch) if pitch is not None else 100.0  # Sanity default
 
     if repeat < 1:
         raise ValueError("repeat must be 1 or greater")