Colorizer round6: completed candidate and independent reports

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experiments/medium-critic-20260928/SHA256SUMS.json

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experiments/medium-critic-20260928/candidate/README.md

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+# Experimental semantic colorizer
+
+Head: palette. Parameters: 3994676.
+
+Not approved for production. Requires semantic_model.py; incompatible with the old U-Net loader. Input is Lab lightness normalized to [-1,1]; output is Lab ab. See the run protocol, provenance, selection and visual comparisons. Predictions are plausible colors, not recovered historical truth.

experiments/medium-critic-20260928/candidate/config.json

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+{
+  "architecture": "SemanticColorizer",
+  "head": "palette",
+  "width": 128,
+  "queries": 16,
+  "format_version": 1
+}

experiments/medium-critic-20260928/candidate/model.safetensors

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+  "warning": "Surface uniformity alone rewards grey collapse; never use alone to select model. Color differences from original are diagnostic only."
+}

experiments/medium-critic-20260928/final_raw_diagnostics.json

@@ -0,0 +1,652 @@
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+  "warning": "Surface uniformity alone rewards grey collapse; never use alone to select model. Color differences from original are diagnostic only."
+}

experiments/medium-critic-20260928/heldout_comparison_key.json

@@ -0,0 +1,6 @@
+{
+  "A": "prior27",
+  "B": "ema",
+  "C": "raw",
+  "D": "v3"
+}

experiments/medium-critic-20260928/prior27_diagnostics.json

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+  "warning": "Surface uniformity alone rewards grey collapse; never use alone to select model. Color differences from original are diagnostic only."
+}

experiments/medium-critic-20260928/status.json

@@ -1,6 +1,8 @@
 {
-  "status": "training_finished",
-  "step": 8000,
-  "elapsed_seconds": 1564.2490073819645,
-  "production_approved": false
+  "status": "completed",
+  "generator_steps": 8000,
+  "stop_reason": "completed",
+  "elapsed_seconds": 1643.7988926339895,
+  "production_approved": false,
+  "next": "Review developmental checkpoint grids and held-out comparisons; this job does not automatically replace v3."
 }

experiments/medium-critic-20260928/v3_diagnostics.json

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+  "summary": {
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+  "warning": "Surface uniformity alone rewards grey collapse; never use alone to select model. Color differences from original are diagnostic only."
+}