CLAUDE: probe inter-corr sel_sensors/num_cams/count + fix saveTDRender NPE (TEMP)

Post-mortem showed both CLT buffers loaded but inter-correlation -> 0 tiles.
index_inter_correlate selects by __popc(sel_sensors); static reading says
sel_sensors should be 1 (single-cam rectilinear), so a runtime value differs.
- GpuQuadJna.execCorr2D_inter_TD: one-shot print sel_sensors/popc/num_cams/
  num_colors/scales + the returned num_corr_tiles.
- saveTDRender: makeArrays NPE'd on null titles (derefs titles[i]); pass a
  non-null titles[] so the render saves instead of crashing the run.
TEMP — remove with the rest of the -Dtp.dbg.corrpair probe.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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

@@ -2939,8 +2939,10 @@ public class CuasMotion {
 	private void saveTDRender(boolean use_reference, String title) {
 		gpuQuad.execImcltRbgAll(gpuQuad.getNumColors() <= 1, use_reference, null);
 		float [][] rbg = gpuQuad.getRBG(0); // single-camera rectilinear
+		String [] titles = new String [rbg.length]; // makeArrays derefs titles[i] -> must be non-null
+		for (int i = 0; i < titles.length; i++) titles[i] = title + "-" + i;
 		ImagePlus imp = ShowDoubleFloatArrays.makeArrays(
-				rbg, gpuQuad.getImageWidth(), gpuQuad.getImageHeight(), title, null);
+				rbg, gpuQuad.getImageWidth(), gpuQuad.getImageHeight(), title, titles);
 		if (imp != null) {
 			parentCLT.saveImagePlusInModelDirectory(imp);
 			System.out.println("saveTDRender(): saved post-mortem render '"+title+"' (use_reference="+use_reference+")");

src/main/java/com/elphel/imagej/gpu/jna/GpuQuadJna.java

@@ -309,10 +309,18 @@ public class GpuQuadJna extends GpuQuad {
         float[] s = scaleTriplet(scales);
         lib.tp_proc_exec_corr2d_td(proc, sel_pairs_in[0], sel_pairs_in[1], sel_pairs_in[2], sel_pairs_in[3], s[0], s[1], s[2]);
     }
+    private boolean inter_td_probed = false; // TEMP probe one-shot (By Claude 06/26/2026), remove after fix
     @Override public void execCorr2D_inter_TD(double[] scales) {
         ensureRbgCorr();
         float[] s = scaleTriplet(scales);
-        lib.tp_proc_exec_corr2d_inter_td(proc, getSensorMaskInter(), s[0], s[1], s[2]);
+        int sel = getSensorMaskInter();
+        int n = lib.tp_proc_exec_corr2d_inter_td(proc, sel, s[0], s[1], s[2]); // returns last_num_corr_tiles
+        if (!inter_td_probed) { // TEMP PROBE — remove after fix
+            inter_td_probed = true;
+            System.out.println(String.format(
+                "PROBE inter_corr: sel_sensors=%d (popc=%d) num_cams=%d num_colors=%d scales[%.3f,%.3f,%.3f] -> num_corr_tiles=%d",
+                sel, Integer.bitCount(sel), num_cams, num_colors, s[0], s[1], s[2], n));
+        }
     }
     @Override public void execCorr2D_combine(boolean init_corr, int num_pairs_in, int pairs_mask, boolean no_transpose_vertical) {
         int num_pairs = getNumUsedPairs();