Add pointnext seed 2026 baseline checkpoints

pointnext/seed_2026/best_loss.pth

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+version https://git-lfs.github.com/spec/v1
+oid sha256:98a06e87d103744a4ec381f52416da764c5abd52d68c838a0a6e97423a112469
+size 49339715

pointnext/seed_2026/best_pmt_miou.pth

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+version https://git-lfs.github.com/spec/v1
+oid sha256:ed455b3989c9da256d8727d56295c7403d00769736f2fff29ecf1b5caa5646f1
+size 49341919

pointnext/seed_2026/config.json

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+{
+  "architectures": [
+    "Stage1DirectBaseline"
+  ],
+  "backbone": "pointnext",
+  "best_loss": 867.9832102814879,
+  "best_pmt_miou": 0.5455231666564941,
+  "dataset": "ZXCCHENGXI/cstnet2_stage1_mini",
+  "epochs": 80,
+  "global_batch_size": 128,
+  "model_config": {
+    "attn_k": 16,
+    "attn_neighbors": 20,
+    "dgcnn_k": 20,
+    "feature_dim": 128,
+    "head_dropout": 0.2,
+    "head_hidden_dim": 128,
+    "model": "pointnext",
+    "pointmamba_depth": 2,
+    "pointmamba_group_size": 32,
+    "pointmamba_tokens": 128,
+    "pointmamba_width": 64,
+    "pointmlp_group_size": 24,
+    "pointnext_k": 24,
+    "pointtransformer_depth": 3,
+    "pointtransformer_k": 16,
+    "pointtransformer_width": 64
+  },
+  "model_type": "cstnet2_stage1_direct_baseline",
+  "per_gpu_batch_size": 32,
+  "point_count": 2048,
+  "precision": "bfloat16",
+  "recommended_checkpoint": "best_pmt_miou.pth",
+  "seed": 2026,
+  "source_code": "https://github.com/xcheng-tsinghua/cstnet2",
+  "world_size": 4
+}

pointnext/seed_2026/last.pth

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+version https://git-lfs.github.com/spec/v1
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+size 49336960