The GSM8K cache-hit regression needs executable coverage for the fp8 paths that combine bs>1 page planning, valid-row writes, prefix materialization, and HiCache L2 reload. These tests construct bs=5 page-aligned layouts and assert valid rows survive the persistent-page store/materialize and host roundtrip paths.
Constraint: Production runs use fp8_e4m3 CP shared KV with page_first_direct HiCache and bs>1 prefill.
Rejected: Validate with bf16-only tests | the observed regressions are fp8/cache-hit sensitive and bf16 coverage does not exercise scale/index byte layouts.
Confidence: medium
Scope-risk: narrow
Directive: Keep fp8 cache-hit tests aligned with the page-as-minimum-cache-unit contract.
Tested: python -m py_compile on changed runtime files.
Not-tested: CUDA/TAI tests not run locally; local pytest blocked before collection by missing orjson dependency.
(cherry picked from commit 6600f75fc8ee803610df0078bb880df808655635)
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