Preserve shared owners and standalone probe callers. Clear obsolete timers and defer temporary torrent destruction until event unwind, holding the queue slot through teardown. Guard cache and replacement inflight identity.
Spec correction: previous queued-only active reuse/cache expectations are replaced by equally strict final-owner cleanup and fresh-request assertions, with independent live/shared/cache controls retained. See unique spec and Test Integrity Note.
Saved focused checks: six files, 60 scenarios, zero failures/cancelled; 19 distinct mutants killed. Remaining full lint/full/build/browser and normal landing require a resource slot. No submission.
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