Claude: Demote INDX_VX/VY/STRENGTH/FRAC to method-local constants

These four constants described the layout of TDCorrTile.getMismatchVector()
return values and had no business being class-level statics in CuasMotion.
Moved to local scope in the two methods that use them: getTargetsFromCorr2d
and refineMotionVectors.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/main/java/com/elphel/imagej/cuas/CuasMotion.java

@@ -46,10 +46,6 @@ public class CuasMotion {
 	final public static String CLEAN_SUFFIX = "-CLEAN";
 	final static public  int MAX_ALT_TARGETS = 100; // convenient to be power of 10
 	
-	final static private int INDX_VX =         0;
-	final static private int INDX_VY =         1;
-	final static private int INDX_STRENGTH =   2;
-	final static private int INDX_FRAC =       3;
 	final static public String LEGEND_TITLE = "Legend";
 	final static public String[] ICON_DESCRIPTIONS = {
 			"Identified UAS",
@@ -1933,13 +1929,15 @@ public class CuasMotion {
 					fat_zero * scale_fat_zero, // *scale_fat_zero,  // final double        gpu_fat_zero,
 					debugLevel);    // final int           debug_level
 
+			// Indices into TDCorrTile.getMismatchVector() result {vx, vy, strength, fraction} // By Claude on 05/08/2026
+			final int INDX_VX = 0, INDX_VY = 1, INDX_STRENGTH = 2, INDX_FRAC = 3;
 			double [][] vector_field = TDCorrTile.getMismatchVector( // full tiles in gpu (512*512)
 					corr_tiles_pd,  // final double[][] tiles,
-					rstr,           // double              rmax, 
+					rstr,           // double              rmax,
 					cent_radius,    // final double        centroid_radius, // 0 - all same weight, > 0 cosine(PI/2*sqrt(dx^2+dy^2)/rad)
 					n_recenter,     // final int           n_recenter); //  re-center window around new maximum. 0 -no refines (single-pass)
 					true);            // final boolean     calc_fraction	){ // calculate fraction inside center circle
-			
+
 			for (int ntile = 0; ntile < num_tiles; ntile++) if (vector_field[ntile] != null){
 				double [] target =  CuasMotionLMA.getEmpty();
 				// Store the raw displacement over one correlation-pair separation
@@ -2169,6 +2167,8 @@ public class CuasMotion {
 				corr2d_ref[nseq] = corr_tiles_pd;
 			}
 
+			// Indices into TDCorrTile.getMismatchVector() result {vx, vy, strength, fraction} // By Claude on 05/08/2026
+			final int INDX_VX = 0, INDX_VY = 1;
 			double[][] vector_field = TDCorrTile.getMismatchVector(
 					corr_tiles_pd,
 					-rstr,        // rmax < 0: no relative-strength filter (same convention as getTargetsFromCorr2d)