pub fn clear_kpsewhich_memo()Expand description
Clear the per-thread kpsewhich memo. Called at the start of every
conversion (prepare_session): the persistent (non-harness) cortex_worker
runs many papers per thread, and a cached cwd-relative MISS from paper A
(kpathsea’s path spec includes .) would wrongly persist into paper B
(PR_READINESS should-fix 12).