Colorizer round6: multi_mix final test and diagnostic outputs

.gitattributes

@@ -274,3 +274,4 @@ experiments/decision-20260928-v2/single_teacher_probes.jpg filter=lfs diff=lfs m
 experiments/decision-20260928-v2/single_mix_probes.jpg filter=lfs diff=lfs merge=lfs -text
 experiments/decision-20260928-v2/single_staged_probes.jpg filter=lfs diff=lfs merge=lfs -text
 experiments/decision-20260928-v2/multi_teacher_probes.jpg filter=lfs diff=lfs merge=lfs -text
+experiments/decision-20260928-v2/multi_mix_probes.jpg filter=lfs diff=lfs merge=lfs -text

experiments/decision-20260928-v2/SHA256SUMS.json

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+  "multi_mix_probes.jpg": "c9d449a611597f5bdb0d495e50a398aaaad807362c4fe42994e43dae8ca357a3",
+  "multi_mix_test.json": "abba7bb00ce557efbdc0ce4383eca30fba095f0bf73c5eb4b8fe92adeee7a6b8",
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experiments/decision-20260928-v2/multi_mix_diagnostics.json

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+}

experiments/decision-20260928-v2/multi_mix_latency.json

@@ -0,0 +1,6 @@
+{
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+  "hardware": "NVIDIA L4",
+  "size": 256,
+  "precision": "FP32"
+}

experiments/decision-20260928-v2/multi_mix_test_paired.json

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