Classified migratable-in-kind (SX suites over epoch, not a foreign runner)
but blocked on driver feature gaps: 8 distinct per-suite counter variable
name pairs and per-suite preload chains, neither supported by MODE=counters
(single global counter + fixed preloads) nor MODE=dict (load-time counter
collisions across suites). Baseline 305/0 across 12 suites. Did not migrate;
conformance.sh left untouched. Driver unchanged (out of per-iteration scope).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
