test(zigux): restack lane16 hweight bench replay runner

[adybag14-cyber]

Summary

• restack zigux/tests/phase1_hweight_bench_replay.zig onto current master as the fresh Lane 16 hweight bench replay path
• add zigux/tests/phase1_hweight_bench_replay_build.zig so the replay has a direct focused zig build route
• expose both a named phase1-hweight-bench-replay step and a plain test alias without reopening helper bodies, shared bench wiring, checker scripts, docs, or workflows

Why This Lane

• Lane 16 owns Phase 1 hardening gates around bench-sensitive helper packets
• stale draft PR test(zigux): add lane16 hweight bench replay #13134 carried the hweight replay alone, but current Lane 16 runners now use a direct build shard pattern
• this fresh current-master branch keeps progress additive and Zig-only while making the hweight packet directly runnable like the neighboring replay runners

Validation

• authenticated master...master compare before branch cut reported status: identical at base SHA bdc09769b16f1dc4815d86a3cce99330955cb177
• authenticated current-master reread confirmed zigux/tests/phase1_hweight_bench_replay.zig returned 404 Not Found before publication
• authenticated current-master reread grounded the replay against live tools/lib/hweight.zig at blob SHA ee3f969449f7279c68026a95bb23ac44b42821c0
• focused scratch validation used the attached Zigux-master.zip scaffold plus the 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_hweight_bench_replay.zig zigux/tests/phase1_hweight_bench_replay_build.zig tools/lib/hweight.zig
• cd zigux/tests && zig build --build-file phase1_hweight_bench_replay_build.zig --list-steps
  • result: step list includes phase1-hweight-bench-replay and test
• cd zigux/tests && zig build phase1-hweight-bench-replay --build-file phase1_hweight_bench_replay_build.zig --summary all
  • result: Build Summary: 3/3 steps succeeded; 2/2 tests passed
  • result: phase1-hweight-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: #14507
• branch: zigux-builder/lane16-hweight-bench-replay-runner-current-master-20260529t0133z
• base commit: bdc09769b16f1dc4815d86a3cce99330955cb177
• files:
  • zigux/tests/phase1_hweight_bench_replay.zig
  • zigux/tests/phase1_hweight_bench_replay_build.zig

Coordination

• supersedes stale hweight replay-only draft PR test(zigux): add lane16 hweight bench replay #13134 as the current-master review path for this packet
• keep draft PR test(zigux): restack lane16 list_sort bench replay runner #14450 as the separate list_sort bench replay runner frontier
• 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 bitmap-weight bench replay and runner #13310 as the separate bitmap-weight replay runner frontier

Validation Boundary

Direct live checkout remains unavailable in this scheduled container, so live repo grounding and publication used authenticated GitHub reads/writes plus focused current-like local validation.

[coderabbitai]

Important

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch zigux-builder/lane16-hweight-bench-replay-runner-current-master-20260529t0133z

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