RichSIMDGeomPhoton: Add write accessors for CK angles

Rich/RichFutureUtils/include/RichFutureUtils/RichSIMDGeomPhoton.h

@@ -129,7 +129,18 @@ namespace Rich::SIMD::Future {
     void setValidityMask( const MASK& valid ) noexcept { m_valid = valid; }
 
   public:
-    // getters
+    // write access getters
+
+    /** Get accessor for the Cherenkov theta angle
+     *  @return the current value of the Cherenkov theta angle */
+    [[nodiscard]] SIMDFP& CherenkovTheta() noexcept { return m_ckTheta; }
+
+    /** Get accessor for Cherenkov phi angle
+     *  @return the current value of the Cherenkov phi angle */
+    [[nodiscard]] SIMDFP& CherenkovPhi() noexcept { return m_ckPhi; }
+
+  public:
+    // read access getters
 
     /** Get accessor for the Cherenkov theta angle
      *  @return the current value of the Cherenkov theta angle */