Add AllBitsSet, refactor WideLane, improve math paths

- Add static AllBitsSet property to ISPMDLane and implement in ScalarLane and WideLane
- Refactor WideLane shuffle table pointers and update usages
- Improve pointer safety and mask handling in CompressStore, Gather, and MaskLoad
- Enhance Sin, Cos, SinCos with fast-math and hardware fallback
- Add Newton-Raphson refinement for reciprocal/sqrt when not fast-math
- Optimize MathV.Vector vector loading (struct init, pointer ops)
- Update project file: version 1.3.4, content packaging, AOT settings
- Minor code cleanup and naming consistency fixes

Misaki.HighPerformance.Mathematics.SPMD/ISPMDLane.cs

@@ -16,14 +16,6 @@ public interface ISPMDLane
     }
 }
 
-// TODO:
-// - ReduceAdd
-// - ReduceMin
-// - ReduceMax
-// - LeadingZeroCount
-// - TrailingZeroCount
-// - PopCount
-
 /// <summary>
 /// Represents a single-lane or multi-lane (vectorized) SPMD value and the operations supported on it.
 /// </summary>
@@ -65,6 +57,14 @@ public unsafe interface ISPMDLane<TSelf, TNumber> : ISPMDLane, IEquatable<TSelf>
         get;
     }
 
+    /// <summary>
+    /// Gets a lane value where all bits are set to 1 for each lane.
+    /// </summary>
+    static abstract TSelf AllBitsSet
+    {
+        get;
+    }
+
     /// <summary>
     /// Gets the element value for the specified lane index.
     /// </summary>