test(zigux): add lane16 phase1 bench output contract

[adybag14-cyber]

Summary

• add zigux/tests/phase1_bench_output_contract.zig as a small Zig contract for the current Phase 1 bench output surface
• encode the helper packet names, iteration labels, and checksum labels that the shipped bench gate reports
• keep the change one-file scoped and off replay bodies, replay runners, helper implementations, shared build wiring, checker scripts, docs, fixtures, and workflows

Why This Lane

• Lane 16 owns Phase 1 hardening gates around the bench-sensitive helper packets
• the active replay runner fronts already cover many individual helper packets, while this file gives the aggregate output surface a lightweight Zig-facing contract on an untouched path
• this is a non-overlapping current-master hardening step that documents and tests the bench packet labels without disturbing the active stacked runner queue

Validation

• authenticated current-master reread confirmed zigux/tests/phase1_bench.zig contains the current Phase 1 bench label surface
• authenticated current-master reread confirmed zigux/tests/phase1_bench_output_contract.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 and raw GitHub download remain blocked in this scheduled runtime
• zig fmt --check zigux/tests/phase1_bench_output_contract.zig
• zig test zigux/tests/phase1_bench_output_contract.zig
  • result: All 2 tests passed.
• 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: Zigux session 2026-05-29 10:35 UTC #15028
• branch: zigux-builder/lane16-bench-output-contract-20260529t1035z
• file:
  • zigux/tests/phase1_bench_output_contract.zig

Coordination

• keep existing replay runner PRs such as 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 stacked paths
• keep checker and workflow fronts untouched

Validation Boundary

Direct live checkout and raw GitHub downloads remain unavailable in this scheduled container, so live repo grounding and publication used authenticated GitHub reads/writes plus focused local validation of the new Zig contract file.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch zigux-builder/lane16-bench-output-contract-20260529t1035z

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