test(zigux): add lane16 bench build contract runner

[adybag14-cyber]

Summary

• add zigux/tests/phase1_bench_build_contract_build.zig as a focused standalone Lane 16 build shard for the existing Phase 1 bench build contract on PR test(zigux): add lane16 phase1 bench build contract #15306
• expose both a named phase1-bench-build-contract step and a plain test alias
• keep the change one-file scoped and stacked, with no edits to the contract body, shared Phase 1 bench files, helper implementations, checker scripts, docs, fixtures, or workflows

Why This Lane

• Lane 16 owns Phase 1 hardening gates around bench-sensitive helper packets
• PR test(zigux): add lane16 phase1 bench build contract #15306 already carries zigux/tests/phase1_bench_build_contract.zig, but that new build-gate contract did not yet have the direct zig build route pattern used by nearby hardening follow-ups
• this runner makes the contract directly runnable without reopening zigux/tests/phase1_bench_build.zig, zigux/tests/phase1_bench.zig, or active replay/checker fronts

Validation

• authenticated base-branch reread confirmed zigux/tests/phase1_bench_build_contract.zig exists on branch zigux-builder/lane16-phase1-bench-build-contract-20260529t1540z
• authenticated base-branch reread confirmed zigux/tests/phase1_bench_build_contract_build.zig returned 404 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 unavailable in this scheduled runtime
• overlaid the exact base-branch phase1_bench_build_contract.zig and phase1_bench_build.zig source from GitHub into scratch for the embedded-file contract check
• zig fmt --check phase1_bench_build_contract.zig phase1_bench_build.zig phase1_bench_build_contract_build.zig
• zig build --build-file phase1_bench_build_contract_build.zig --list-steps
  • result: step list includes phase1-bench-build-contract and test
• zig build phase1-bench-build-contract --build-file phase1_bench_build_contract_build.zig --summary all
  • result: Build Summary: 3/3 steps succeeded; 2/2 tests passed
• zig build test --build-file phase1_bench_build_contract_build.zig --summary all
  • result: Build Summary: 3/3 steps succeeded; 2/2 tests passed

Scope

• lane: Lane 16 — Phase 1 hardening gates
• session issue: Zigux session 2026-05-29 16:30 UTC - Lane 16 bench build contract runner #15359
• base PR: test(zigux): add lane16 phase1 bench build contract #15306
• base branch: zigux-builder/lane16-phase1-bench-build-contract-20260529t1540z
• branch: zigux-builder/lane16-bench-build-contract-runner-20260529t1632z
• file:
  • zigux/tests/phase1_bench_build_contract_build.zig

Coordination

• keep PR test(zigux): add lane16 phase1 bench build contract #15306 as the separate bench build contract body frontier
• keep PR test(zigux): add lane16 bench output contract runner #15254 as the separate bench output contract runner frontier
• keep PR test(zigux): add lane16 phase1 bench output contract #15033 as the separate bench output contract body frontier
• keep replay runner PRs such as test(zigux): add lane16 find_next_and_bit bench runner #15091, test(zigux): add lane16 findNextAndBit replay runner #14977, test(zigux): add lane16 rbtree findAddCached replay runner #14922, test(zigux): add lane16 rbtree findAdd replay runner #14806, test(zigux): add lane16 rbtree postorder replay runner #14749, test(zigux): add lane16 bitmap-window bench replay runner #14688, test(zigux): add lane16 rbtree cached bench replay runner #14628, test(zigux): add lane16 rbtree duplicate mutation replay runner #14569, test(zigux): restack lane16 hweight bench replay runner #14511, test(zigux): restack lane16 list_sort bench replay runner #14450, test(zigux): add lane16 rbtree bench replay runner #14329, test(zigux): add lane16 find_next_bit bench replay runner #14266, test(zigux): add lane16 find_bit bench replay runner #14147, test(zigux): add lane16 find_next_and_bit bench replay runner #14090, test(zigux): add lane16 find_next_zero_bit bench replay runner #14031, test(zigux): add lane16 string bench replay runner #13972, and test(zigux): add lane16 find_bit edge bench replay runner #13915 on their separate paths
• keep checker and workflow fronts untouched

Validation Boundary

Direct live checkout remains unavailable in this scheduled container, so live repo grounding and publication used authenticated GitHub reads/writes plus focused scratch 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-bench-build-contract-runner-20260529t1632z

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