Compare Qwen cache snapshots at matching stages

docs/issue114-snapshot-zero/glm.log

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+
+running 1 test
+test engine::metal::glm::tests::glm53_two_row_verifier_restores_recurrent_state ... ds4: Metal device Apple M5 Max, 128.00 GiB RAM
+ds4: Metal 4 tensor API enabled for Tensor kernels
+ds4: drift-patch flags hc_stable=on norm_unify=on kv_raw_f32=off rope_exp2_log2=off math_safe=off tensor_matmul=on
+ds4: Metal model views created in 2.052 ms, residency requested in 10681.125 ms, warmup 3.104 ms (mapped 92026.06 MiB from offset 9.07 MiB)
+ds4: Metal mapped mmaped model as 2 overlapping shared buffers
+verify2 prefill 0
+verify2 prefill 4
+verify2 prefill 8
+verify2 prefill 12
+partial prefill HC workspace guards passed
+partial prefill HC workspace guards passed
+partial prefill HC workspace guards passed
+partial prefill HC workspace guards passed
+partial prefill HC workspace guards passed
+verify2 prefill 0
+verify2 prefill 4
+verify2 prefill 8
+verify2 prefill 12
+ds4: GLM MTP verify2 at 12: 43.795 ms, draft 729, target 729
+ds4: GLM MTP draft 387 at position 13 in 2.4 ms
+verify2 accepted and rewind keep=0 passed
+verify2 prefill 0
+verify2 prefill 4
+verify2 prefill 8
+verify2 prefill 12
+ds4: GLM MTP verify2 at 12: 38.788 ms, draft 729, target 729
+ds4: GLM MTP draft 387 at position 13 in 2.3 ms
+verify2 accepted and rewind keep=1 passed
+verify2 prefill 0
+verify2 prefill 4
+verify2 prefill 8
+verify2 prefill 12
+ds4: GLM MTP verify2 at 12: 38.730 ms, draft 730, target 729
+ds4: GLM MTP draft 5733 at position 12 in 2.4 ms
+verify2 rejected and scalar replay state passed
+verify2 prefill 0
+verify2 prefill 4
+verify2 prefill 8
+verify2 prefill 12
+ds4: GLM MTP draft 5733 at position 12 in 2.4 ms
+verify2 scalar boundary cap=1 cancelled=false passed
+verify2 prefill 0
+verify2 prefill 4
+verify2 prefill 8
+verify2 prefill 12
+ds4: GLM MTP draft 5733 at position 12 in 2.4 ms
+verify2 scalar boundary cap=2 cancelled=true passed
+verify2 prefill 0
+verify2 prefill 4
+verify2 prefill 8
+verify2 prefill 12
+ds4: GLM MTP draft 5733 at position 12 in 2.4 ms
+engine-lifetime counters across new and restored chats passed
+ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 549 filtered out; finished in 12.69s