CLAUDE: item-4 R3c - timestamp matching keys on canonical sec_usec prefix...

CLAUDE: item-4 R3c - timestamp matching keys on canonical sec_usec prefix (merged labels carry -N suffix)

First A/B run 07/20 00:22 failed loud: merged-stack slice labels are
'<ts>-0' while -CUAS-RT-LOG labels are bare '<ts>' - exact match missed
all 497. tsKey() takes the leading digits/underscore run from both sides.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/main/java/com/elphel/imagej/cuas/rt/CuasDetectRT.java

@@ -296,6 +296,14 @@ public class CuasDetectRT {
 		return;
 	}
 	
+	/** Canonical scene key: the leading digits/underscore run of a slice label ("1773135467_917220-0"
+	 *  and "1773135467_917220" -> "1773135467_917220"). Item 4 R3 timestamp matching. By Claude on 07/20/2026 */
+	private static String tsKey(String label) {
+		int n = 0;
+		while ((n < label.length()) && (Character.isDigit(label.charAt(n)) || (label.charAt(n) == '_'))) n++;
+		return label.substring(0, n);
+	}
+
 	public static String d2s(double d, int maxDecimalsPlaces) {
 		String fmt = String.format("%%.%df", maxDecimalsPlaces);
 		String s = String.format(fmt, d);
@@ -1126,19 +1134,22 @@ public class CuasDetectRT {
 
        		QuadCLTCPU.saveImagePlusInDirectory(imp_conv2d, getModelDirectory());
        	}
+       	// item 4 R3: canonical scene key = the leading "<sec>_<usec>" digits of a slice label.
+       	// The merged stack suffixes its labels (e.g. "1773135467_917220-0") while -CUAS-RT-LOG labels
+       	// are bare scene names - exact string match missed all 497 (found 07/20 first A/B run). By Claude on 07/20/2026
        	if (!rt_log_primary && (rt_log_pixels != null)) { // item 4 R3: compare the offline conditioned frames vs the RT stream, then SWAP the RT frames in // By Claude on 07/19/2026
        		// RELATIVE tol tier (ruling 3.3): offline = LoG(frame - whole-sequence union mean), RT = GPU LoG(frame) - base
        		// (prior-run average LoG'd in Java double, + gated EMA if enabled). Equal by LINEARITY only when the bases match
        		// (RT run with det_avg_file = the SAME sequence's -CUAS-RT-AVG and det_ema_rate = 0) and except at NaN-substitution
        		// edges; the compare REPORTS (no hard gate) - the verdict is Andrey's per 3.3.
        		final java.util.HashMap<String, float[]> rt_map = new java.util.HashMap<String, float[]>();
-       		for (int i = 0; i < rt_log_ts.length; i++) rt_map.put(rt_log_ts[i], rt_log_pixels[i]);
+       		for (int i = 0; i < rt_log_ts.length; i++) rt_map.put(tsKey(rt_log_ts[i]), rt_log_pixels[i]);
        		final boolean cmp = clt_parameters.curt.subtract_avg; // without SUBAVG the offline frames have no background subtracted - numbers would be apples-to-oranges
        		int matched = 0;
        		java.util.ArrayList<String> missing = new java.util.ArrayList<String>();
        		double worst_rel = 0.0, sum_rel = 0.0; int worst_i = -1; long nan_mm_total = 0;
        		for (int i = 0; i < dpixels_log.length; i++) {
-       			float [] rt = rt_map.get(time_stamps[i]);
+       			float [] rt = rt_map.get(tsKey(time_stamps[i]));
        			if (rt == null) { missing.add(time_stamps[i]); continue; }
        			matched++;
        			if (cmp) {