fix(cache): route null decode pages to dummy slot - #1169
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Keep fused target and DFlash decode writes consistent with the general cache-location contract so null or reclaimed pages cannot scatter writes across page zero. Signed-off-by: Jin Pan <jin.pan@amd.com>
This was referenced Aug 20, 2026
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Summary
This is an independently landable correctness fix found while investigating #1132. At exact 131K it only changed average accepted length from 1.0000 to 1.0365, so it is not presented as the full acceptance-collapse fix.
Test plan
pytest -q test/runtime/test_decode_cache_loc.py test/runtime/test_sliding_cache_loc.py(11 passedon gfx950)isort --check-onlyandblack --checkon the changed Python files