int8: keep each part's most quantisation-sensitive layer at fp32, tuned against off-distribution probes

v1-decoder-int8.onnx

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:15c55a69b3f2ae62f19b4c2609ec7512d8ad26d031d74c9f3c3518f4a49e4acb
-size 6778839
+oid sha256:e435e263c094509e6d99890ed34b9de4790e15ed058b035f2536e73494c59e8d
+size 8602844

v1-onnx-manifest.json

@@ -8,7 +8,9 @@
     "encoder": [
       "node_conv2d_2"
     ],
-    "decoder": []
+    "decoder": [
+      "node_conv2d"
+    ]
   },
   "artifacts": {
     "v1-encoder-fp32.onnx": {
@@ -32,8 +34,8 @@
       "bytes": 6464002
     },
     "v1-decoder-int8.onnx": {
-      "sha256": "15c55a69b3f2ae62f19b4c2609ec7512d8ad26d031d74c9f3c3518f4a49e4acb",
-      "bytes": 6778839
+      "sha256": "e435e263c094509e6d99890ed34b9de4790e15ed058b035f2536e73494c59e8d",
+      "bytes": 8602844
     }
   },
   "verification": [
@@ -69,11 +71,11 @@
       "latent_max": 1.3742269277572632,
       "latent_vs_channel_db": 14.011981897101704,
       "torch_psnr_db": 26.7079361125645,
-      "onnx_psnr_db": 26.52091253782323,
-      "quality_lost_db": 0.1870235747412714,
-      "decoder_vs_torch_psnr_db": 38.620711030522656,
+      "onnx_psnr_db": 26.706312481651203,
+      "quality_lost_db": 0.0016236309132970916,
+      "decoder_vs_torch_psnr_db": 49.66495055474868,
       "encoder_mb": 6.464002,
-      "decoder_mb": 6.778839,
+      "decoder_mb": 8.602844,
       "ok": true
     }
   ]