Preserve Athena Qwen baseline and document ByteShape comparison

benchmarks/athena-qwen38-reference-20260920/cases/mix-single-76800-ub64/config.json

@@ -0,0 +1,12 @@
+{
+  "label": "mix-single-76800-ub64",
+  "model": "mix",
+  "ctx": 76800,
+  "single": true,
+  "ubatch": 64,
+  "mtp": 2,
+  "prompts": [
+    49152,
+    75776
+  ]
+}

benchmarks/athena-qwen38-reference-20260920/cases/pure-dual-262144-80-20/config.json

@@ -0,0 +1,13 @@
+{
+  "label": "pure-dual-262144-80-20",
+  "model": "pure",
+  "ctx": 262144,
+  "single": false,
+  "split": "80,20",
+  "ubatch": 128,
+  "mtp": 2,
+  "prompts": [
+    49152,
+    261120
+  ]
+}

benchmarks/athena-qwen38-reference-20260920/cases/pure-single-32768-repeat/config.json

@@ -0,0 +1,9 @@
+{
+  "label": "pure-single-32768-repeat",
+  "model": "pure",
+  "ctx": 32768,
+  "single": true,
+  "prompts": [
+    4096
+  ]
+}

benchmarks/athena-qwen38-reference-20260920/cases/pure-single-32768/config.json

@@ -0,0 +1,11 @@
+{
+  "label": "pure-single-32768",
+  "model": "pure",
+  "ctx": 32768,
+  "single": true,
+  "quality": true,
+  "prompts": [
+    4096,
+    24576
+  ]
+}

benchmarks/athena-qwen38-reference-20260920/cases/pure-single-57344/config.json

@@ -0,0 +1,11 @@
+{
+  "label": "pure-single-57344",
+  "model": "pure",
+  "ctx": 57344,
+  "single": true,
+  "prompts": [
+    49152,
+    56320
+  ],
+  "quality_followup": true
+}

benchmarks/athena-qwen38-reference-20260920/cases/pure-single-61440-ub128/config.json

@@ -0,0 +1,10 @@
+{
+  "label": "pure-single-61440-ub128",
+  "model": "pure",
+  "ctx": 61440,
+  "single": true,
+  "ubatch": 128,
+  "prompts": [
+    60416
+  ]
+}

benchmarks/athena-qwen38-reference-20260920/cases/pure-single-ub128-validated-50176/config.json

@@ -0,0 +1,13 @@
+{
+  "label": "pure-single-ub128-validated-50176",
+  "model": "pure",
+  "ctx": 50176,
+  "single": true,
+  "ubatch": 128,
+  "capacity_search": true,
+  "load_only": false,
+  "prompts": [
+    49152,
+    49152
+  ]
+}