[docs] Start ues CLAUDE rules.

.claude/rules/testing.md

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+# Testing
+
+## Chunked Attention Test
+
+```bash
+CUDA_VISIBLE_DEVICES=4,5 python tests/test_chunked_attention.py 6 2048 64 2
+# Args: num_gpu_blocks input_len output_len num_prefetch_blocks
+```
+
+## CPU Offload Testing
+
+```bash
+# Basic test with limited GPU blocks to trigger offload
+CUDA_VISIBLE_DEVICES=4,5 python tests/test_chunked_attention.py 6 2048 64 2
+
+# Verify consistency (run multiple times, output should be identical)
+for i in 1 2 3; do
+  CUDA_VISIBLE_DEVICES=4,5 python tests/test_chunked_attention.py 6 2048 32 2 2>&1 | tail -3
+done
+```