test(zigux): add lane16 bitmap-window bench replay runner

[adybag14-cyber]

Summary

• add zigux/tests/phase1_bitmap_window_bench_replay_build.zig as a focused standalone Lane 16 build shard for the existing bitmap-window replay on PR test(zigux): add lane16 bitmap-window bench replay #13250
• expose both a named phase1-bitmap-window-bench-replay step and a plain test alias
• keep the change one-file scoped and additive so it stays off the replay body, shared bench wiring, helper bodies, checker scripts, docs, and workflows

Why This Lane

• Lane 16 owns the Phase 1 hardening gates around bench-sensitive helper packets
• PR test(zigux): add lane16 bitmap-window bench replay #13250 already carries zigux/tests/phase1_bitmap_window_bench_replay.zig, but the replay did not yet have its own direct zig build route
• this stacked runner follows the newer Lane 16 shard pattern without widening into zigux/tests/phase1_bench_build.zig or the helper implementations

Validation

• authenticated base-branch reread confirmed zigux/tests/phase1_bitmap_window_bench_replay.zig exists on branch zigux-builder/lane16-bitmap-window-bench-replay-current-master-20260528t0436z
• authenticated base-branch reread confirmed zigux/tests/phase1_bitmap_window_bench_replay_build.zig returned 404 Not Found before publication
• 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 remains blocked in this scheduled runtime
• zig fmt --check zigux/tests/phase1_bitmap_window_bench_replay.zig zigux/tests/phase1_bitmap_window_bench_replay_build.zig tools/lib/bitmap.zig tools/lib/find_bit.zig
• cd zigux/tests && zig build --build-file phase1_bitmap_window_bench_replay_build.zig --list-steps
  • result: step list includes phase1-bitmap-window-bench-replay and test
• cd zigux/tests && zig build phase1-bitmap-window-bench-replay --build-file phase1_bitmap_window_bench_replay_build.zig --summary all
  • result: Build Summary: 3/3 steps succeeded; 2/2 tests passed
  • result: phase1-bitmap-window-bench-replay success
• authenticated compare after publication:
  • changed files: 1
  • result: ahead_by: 1
  • result: behind_by: 0
  • result: status: ahead

Scope

• lane: Lane 16 — Phase 1 hardening gates
• session issue: #14685
• base PR: #13250
• branch: zigux-builder/lane16-bitmap-window-bench-replay-build-followup-20260529t0432z
• file:
  • zigux/tests/phase1_bitmap_window_bench_replay_build.zig
• intentionally no edits to zigux/tests/phase1_bitmap_window_bench_replay.zig, zigux/tests/phase1_bench.zig, zigux/tests/phase1_bench_build.zig, tools/lib/bitmap.zig, tools/lib/find_bit.zig, or scripts/zigux/check-phase1-bench.py

Coordination

• keep PR test(zigux): add lane16 rbtree cached bench replay runner #14628 as the separate rbtree cached replay+runner frontier
• keep PR test(zigux): add lane16 rbtree duplicate mutation replay runner #14569 as the separate rbtree duplicate-mutation replay runner frontier
• keep PR test(zigux): restack lane16 hweight bench replay runner #14511 as the separate hweight replay runner frontier
• keep PR test(zigux): restack lane16 list_sort bench replay runner #14450 as the separate list_sort replay runner frontier
• keep PR test(zigux): add lane16 rbtree bench replay runner #14329 as the separate plain rbtree replay runner frontier
• keep PR test(zigux): add lane16 find_next_bit bench replay runner #14266 as the separate findNextBit(...) replay runner frontier
• keep PR test(zigux): add lane16 find_bit bench replay runner #14147 as the separate baseline find_bit replay runner frontier
• keep PR test(zigux): add lane16 find_next_and_bit bench replay runner #14090 as the separate findNextAndBit(...) replay runner frontier
• keep PR test(zigux): add lane16 find_next_zero_bit bench replay runner #14031 as the separate findNextZeroBit(...) replay runner frontier
• keep PR test(zigux): add lane16 string bench replay runner #13972 as the separate string replay runner frontier
• keep PR test(zigux): add lane16 find_bit edge bench replay runner #13915 as the separate find_bit edge replay runner frontier
• keep PR test(zigux): add lane16 bitmap-weight bench replay and runner #13310 as the separate bitmap-weight replay+runner frontier
• keep checker and aggregate bench packet fronts untouched

Validation Boundary

Direct live checkout remains unavailable in this scheduled container due CONNECT tunnel failed, response 403, so live repo grounding and publication used authenticated GitHub reads/writes plus focused current-like local validation.

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch zigux-builder/lane16-bitmap-window-bench-replay-build-followup-20260529t0432z

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