fix(posts): Cincinnati CL sub-program frames, head raises and dead settings

Part sub-program calls restored the sheet frame with G92 at the part
corner while the tool sat at the sub-program's last endpoint, shifting
every later part. The call now raises the head, rapids back to local 0,0
and restores there. Parts share a sub-program only when their posted
toolpaths match, so per-part lead-ins are kept.

Suppressed moves are left uncut: the cut resumes with a rapid past them.

Head raises go before the rapid that leaves a feature, one per rapid:
the safety raise now precedes the rapid to a new part instead of
following its first feature, and sub-program mode no longer posts M47
then M47 P2000. M47Mode.Auto posts M47 before rapids longer than
M47OverrideDistanceThreshold and /M47 otherwise. ExteriorM47 applies to
the contour spanning the part's cut extents.

The sheet GOTO targets FeatureLineNumberStart and is omitted without line
numbers. PrepareForNest pre-selects only the gas- and thickness-matching
library. Part programs are read through absolute copies, never switched
to absolute in place.

Removes the unimplemented UseSheetSubprograms, CoordModeBetweenParts and
ProcessParameterMode (G89Mode); old configs still load.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Posts/OpenNest.Posts.Cincinnati/MaterialLibraryResolver.cs

@@ -24,13 +24,26 @@ public sealed class MaterialLibraryResolver
         if (!string.IsNullOrEmpty(_selectedLibrary))
             return EnsureLibExtension(_selectedLibrary);
 
-        var entry = _materialLibraries.FirstOrDefault(e =>
+        var entry = FindCutEntry(_materialLibraries, materialName, thickness, gas);
+        return EnsureLibExtension(entry?.Library ?? "");
+    }
+
+    /// <summary>
+    /// The first cut library entry for this material, thickness (within tolerance) and
+    /// assist gas, or null when none matches.
+    /// </summary>
+    public static MaterialLibraryEntry FindCutEntry(
+        IEnumerable<MaterialLibraryEntry> entries,
+        string materialName,
+        double thickness,
+        string gas
+    )
+    {
+        return entries?.FirstOrDefault(e =>
             string.Equals(e.Material, materialName, StringComparison.OrdinalIgnoreCase)
             && System.Math.Abs(e.Thickness - thickness) <= ThicknessTolerance
             && string.Equals(e.Gas, gas, StringComparison.OrdinalIgnoreCase)
         );
-
-        return EnsureLibExtension(entry?.Library ?? "");
     }
 
     public string ResolveEtchLibrary(string gas)