APS5_NO_PERF_DISK_PLANS=1 is listed as a neutral switch, so it stays out
of the variant key, and it exists to compare warm starts with and
without stored plans. Nothing tested either property: the cross-process
test ran with the switch unset only.
A fourth child process now sets the switch against the cache the first
process filled. It must run the front end for all 14 fixtures, neither
load nor store a plan, still hit all 14 stored variants, and produce the
same SPIR-V, bindings, push constants, snapshots, read traces and plans
as the first process.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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