CTS Building Builder Pro v1.0.19

TRUE CONTINUOUS GROOVES
- Connected and curved selected-line grooves now use one swept solid cutter.
- The cutter follows the complete line, arc or segmented curve before touching
  the wall; it no longer creates a separate recess with an end cap per face.
- Internal bend caps are removed by the continuous subtraction itself.
- Only the two real path ends are capped.
- Works across sharp L corners, angled returns and faceted curved walls.

WIDTH PROFILE
- Outside Width is maintained at the visible wall surface.
- Inside Width is maintained at the recessed floor on either side of a turn.
- Equal values make a rectangular groove; unequal values make a continuous
  tapered groove around the complete path.

SAFETY
- Every cutter is built and checked as a closed solid before wall subtraction.
- Every result must remain a closed wall solid or the complete operation rolls back.
- The established per-face native engine remains as fallback for paths without bends.

All previous tools and properties are retained.
