test(zigux): add lane16 list_sort bench replay

[adybag14-cyber]

Summary

• add zigux/tests/phase1_list_sort_bench_replay.zig as a standalone Lane 16 replay for the list_sort packet from zigux/tests/phase1_bench.zig
• keep the pass one-file scoped to the stable ordering witness and the exact 1000-iteration checksum contract
• land real .zig progress without reopening zigux/tests/build.zig, scripts/zigux/check-phase1-bench.py, or the active Lane 16 rbtree and checker fronts

Why This Lane

• Lane 16 owns the bounded Phase 1 hardening-gates slice around the bench-sensitive helper packets
• fresh same-lane review paths already cover the find_bit edge packet and several rbtree bench packets, but the list_sort bench packet still lacked its own standalone tests-root witness on current master
• a new one-file replay is the smallest honest non-overlapping move because it strengthens the live Phase 1 bench surface while staying additive and helper-local to the tests root

Validation

• exact current-master reread confirmed zigux/tests/phase1_list_sort_bench_replay.zig returned 404 Not Found before publication
• exact current-helper reread grounded the replay against live tools/lib/list_sort.zig blob 1cfde887dbd6bfaa5b1e4dec6948075a58c57e78
• focused scratch validation used the attached repo archive plus the attached Zig 0.17.0-dev.87+9b177a7d2 toolchain because this runtime still could not open a trustworthy live checkout of adybag14-cyber/Zigux
• zig fmt --check zigux/tests/phase1_list_sort_bench_replay.zig
• zig test --dep list_sort -Mroot=zigux/tests/phase1_list_sort_bench_replay.zig -Mlist_sort=tools/lib/list_sort.zig -O ReleaseSafe
  • result: All 2 tests passed.

Scope

• lane: Lane 16 — Phase 1 hardening gates
• session issue: #13023
• branch: zigux-builder/lane16-list-sort-bench-replay-current-master-20260528t0055z
• file:
  • zigux/tests/phase1_list_sort_bench_replay.zig
• intentionally no edits to tools/lib/list_sort.zig, zigux/tests/build.zig, scripts/zigux/check-phase1-bench.py, or the separate Lane 16 checker and replay fronts

Coordination

• keep draft PR #12959 as the separate rbtree postorder bench replay frontier
• keep draft PR #12902 as the separate rbtree duplicate-mutation bench replay frontier
• keep draft PR #12850 as the separate rbtree findAdd(...) replay frontier
• keep draft PR #12794 as the separate rbtree duplicate-range replay frontier
• keep draft PR #12743 as the separate find_bit edge replay frontier
• keep draft PR #12638 as the separate cached-root replay runner frontier
• keep draft PR #12566 as the separate rbtree bench guard frontier
• keep draft PR #12459 as the separate reminder-packet-members checker frontier
• keep draft PR #11790 as the separate historical gap-packet frontier
• keep draft PR #11043 as the separate current-bench-packet checker frontier
• keep draft PR #2203 as the separate bench-reminder checker path
• keep draft PR #2022 as the separate closure-gates workflow path

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• Create PR with unit tests
• Commit unit tests in branch zigux-builder/lane16-list-sort-bench-replay-current-master-20260528t0055z

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[adybag14-cyber]

Superseded by current-master draft PR #14450, which carries the same Lane 16 list_sort bench replay plus the dedicated phase1_list_sort_bench_replay_build.zig runner. I also briefly added the runner on this older branch during the follow-up, but the branch is now substantially behind master, so #14450 is the cleaner review path.