test(zigux): add lane17 bench patch contract build route

[adybag14-cyber]

Summary

• add zigux/tests/lane17_phase1_bench_live_step_patch_contract_build.zig as a focused build route for PR test(zigux): add lane17 bench live step patch contract #14513's Lane 17 Phase 1 bench live-step patch contract
• expose both lane17-phase1-bench-live-step-patch-contract and test build steps for the existing contract file
• keep the change stacked on the patch-contract branch and avoid editing the shared bootstrap workflow directly from the no-checkout scheduled runtime

Why This Lane

• Lane 17 owns Phase 1 workflow viability hardening
• PR test(zigux): add lane17 bench live step patch contract #14513 models the exact missing Check current Phase 1 bench packet insertion before .github/workflows/zigux-bootstrap.yml is edited
• this follow-up makes that patch-shape contract runnable through the normal zig build path, matching the runner hardening already done for the applied-state contract on PR test(zigux): add lane17 bench workflow contract runner #14629

Validation

• base branch read confirmed zigux/tests/lane17_phase1_bench_live_step_patch_contract_build.zig was absent before publication
• focused scratch validation used the attached Zig 0.17.0-dev.87+9b177a7d2 toolchain
• zig fmt --check zigux/tests/lane17_phase1_bench_live_step_patch_contract.zig zigux/tests/lane17_phase1_bench_live_step_patch_contract_build.zig
• cd zigux/tests && zig build --build-file lane17_phase1_bench_live_step_patch_contract_build.zig --list-steps
  • result: step list includes lane17-phase1-bench-live-step-patch-contract and test
• cd zigux/tests && zig build lane17-phase1-bench-live-step-patch-contract --build-file lane17_phase1_bench_live_step_patch_contract_build.zig --summary all
  • result: Build Summary: 3/3 steps succeeded; 4/4 tests passed
• authenticated compare against base branch after publication:
  • changed file: zigux/tests/lane17_phase1_bench_live_step_patch_contract_build.zig
  • result: ahead_by: 1
  • result: behind_by: 0
  • result: status: ahead

Scope

• lane: Lane 17 — Phase 1 workflow viability hardening
• session issue: Zigux session 2026-05-29 04:32 UTC #14687
• base PR: test(zigux): add lane17 bench live step patch contract #14513
• base branch: zigux-builder/lane17-bench-live-step-patch-contract-20260529t0132z
• branch: zigux-builder/lane17-bench-live-step-patch-runner-20260529t0437z
• file:
  • zigux/tests/lane17_phase1_bench_live_step_patch_contract_build.zig

Coordination

• keep PR test(zigux): add lane17 bench live step patch contract #14513 as the underlying patch-shape contract
• keep PR test(zigux): add lane17 applied bench workflow contract #14571 / test(zigux): add lane17 bench workflow contract runner #14629 as the separate applied-state contract and runner stack
• the actual workflow insertion remains the next direct Lane 17 step once a safe full-file workflow update path is available

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch zigux-builder/lane17-bench-live-step-patch-runner-20260529t0437z

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