Add 3B fp16 seed + 7B negative-control cards

cards/seed_multimethod_qwen2.5-7b-instruct.json

@@ -0,0 +1,19 @@
+{
+  "harness_version": "mbe-0.2.0",
+  "run_type": "GPU seed run across families (negative control: 4-bit weights)",
+  "model": "Qwen/Qwen2.5-7B-Instruct",
+  "task": "passkey retrieval (synthetic, single needle)",
+  "n_samples": 20,
+  "hardware": "cuda / 4-bit weights",
+  "note": "Negative control: weights AND KV cache both 4-bit (model loaded in 4-bit to fit a 16GB T4). Double quantization compounds error and collapses retrieval; not a clean KV-quant result. For a clean test use fp16 weights (see the 3B fp16 card).",
+  "families": "quantization (KIVI) + eviction (StreamingLLM sink+window, H2O heavy-hitter)",
+  "results": [
+    {"method": "full", "kv_budget": "100%", "passkey_acc": 1.0},
+    {"method": "kivi-4bit", "kv_budget": "25.0%", "passkey_acc": 0.0},
+    {"method": "kivi-4bit", "kv_budget": "12.5%", "passkey_acc": 0.0},
+    {"method": "streaming", "kv_budget": "25.0%", "passkey_acc": 0.0},
+    {"method": "streaming", "kv_budget": "12.5%", "passkey_acc": 0.0},
+    {"method": "h2o", "kv_budget": "25.0%", "passkey_acc": 0.0},
+    {"method": "h2o", "kv_budget": "12.5%", "passkey_acc": 0.0}
+  ]
+}