test(zigux): restack lane16 list_sort bench replay runner

[adybag14-cyber]

Summary

• restack the Lane 16 list_sort bench replay onto current master
• add zigux/tests/phase1_list_sort_bench_replay_build.zig so the replay has a dedicated direct zig build route
• expose both a named phase1-list-sort-bench-replay step and a plain test alias without reopening zigux/tests/phase1_bench.zig, shared build wiring, or tools/lib/list_sort.zig

Why This Lane

• Lane 16 owns Phase 1 hardening gates around bench-sensitive helper packets
• older draft PR test(zigux): add lane16 list_sort bench replay #13027 carried the replay alone but is now substantially behind current master
• this current-master restack keeps the write set additive and Zig-only while making the list_sort packet directly runnable like the newer Lane 16 replay runners

Validation

• exact current-master compare before branch cut used base SHA bdc09769b16f1dc4815d86a3cce99330955cb177
• exact current-master reread confirmed zigux/tests/phase1_list_sort_bench_replay.zig returned 404 Not Found before this restack
• exact branch reread of old PR test(zigux): add lane16 list_sort bench replay #13027 confirmed the replay body and confirmed zigux/tests/phase1_list_sort_bench_replay_build.zig was absent there before the runner follow-up
• focused scratch validation used the attached Zigux-master.zip scaffold plus attached Zig 0.17.0-dev.87+9b177a7d2 toolchain because direct live checkout is not reliable in this scheduled runtime
• zig fmt --check zigux/tests/phase1_list_sort_bench_replay.zig zigux/tests/phase1_list_sort_bench_replay_build.zig tools/lib/list_sort.zig
• cd zigux/tests && zig build --build-file phase1_list_sort_bench_replay_build.zig --list-steps
  • result: step list includes phase1-list-sort-bench-replay and test
• cd zigux/tests && zig build phase1-list-sort-bench-replay --build-file phase1_list_sort_bench_replay_build.zig --summary all
  • result: Build Summary: 3/3 steps succeeded; 2/2 tests passed
  • result: phase1-list-sort-bench-replay success
• authenticated compare after publication:
  • changed files: 2
  • result: ahead_by: 2
  • result: behind_by: 0
  • result: status: ahead

Scope

• lane: Lane 16 — Phase 1 hardening gates
• session issue: Zigux session 2026-05-29 00:33 UTC Lane 16 list_sort replay runner #14446
• branch: zigux-builder/lane16-list-sort-bench-replay-runner-current-master-20260529t0036z
• base commit: bdc09769b16f1dc4815d86a3cce99330955cb177
• files:
  • zigux/tests/phase1_list_sort_bench_replay.zig
  • zigux/tests/phase1_list_sort_bench_replay_build.zig

Coordination

• supersedes stale replay-only draft PR test(zigux): add lane16 list_sort bench replay #13027 as the current-master review path for this packet
• keep draft PR test(zigux): add lane16 rbtree bench replay runner #14329 as the separate rbtree replay runner frontier
• keep draft PR test(zigux): add lane16 find_next_bit bench replay runner #14266 as the separate findNextBit(...) replay runner frontier
• keep draft PR test(zigux): add lane16 find_bit bench replay runner #14147 as the separate baseline find_bit replay runner frontier
• keep draft PR test(zigux): add lane16 find_next_and_bit bench replay runner #14090 as the separate findNextAndBit(...) replay runner frontier
• keep draft PR test(zigux): add lane16 find_next_zero_bit bench replay runner #14031 as the separate findNextZeroBit(...) replay runner frontier
• keep draft PR test(zigux): add lane16 string bench replay runner #13972 as the separate string replay runner frontier
• keep draft PR test(zigux): add lane16 find_bit edge bench replay runner #13915 as the separate find_bit edge replay runner frontier
• keep draft PR test(zigux): add lane16 rbtree postorder bench replay #12959 as the separate rbtree postorder replay frontier
• keep draft PR test(scripts/zigux): restack lane16 rbtree bench guard on current master #12566 as the separate rbtree bench guard frontier
• keep draft PR test(scripts/zigux): restack lane16 reminder packet members guard on current master #12459 as the separate reminder-packet-members checker frontier
• keep draft PR test(scripts/zigux): restack lane16 current bench packet guard #11043 as the separate current-bench-packet guard frontier
• keep draft PR test(scripts/zigux): refresh lane16 bench reminder checker #2203 as the separate bench-reminder checker path
• keep draft PR ci(zigux): wire lane16 closure-gates guard into bootstrap workflow #2022 as the separate closure-gates workflow path

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch zigux-builder/lane16-list-sort-bench-replay-runner-current-master-20260529t0036z

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