test(zigux): add lane17 bench workflow contract runner

[adybag14-cyber]

Summary

• add zigux/tests/lane17_phase1_bench_live_workflow_applied_contract_build.zig as a focused build route for the Lane 17 applied bench workflow contract on PR test(zigux): add lane17 applied bench workflow contract #14571
• tighten the existing contract so the miswired live step is rejected by requiring exactly one bench self-test command in the protected slice
• keep the change stacked on test(zigux): add lane17 applied bench workflow contract #14571 and scoped to the Lane 17 contract files

Why This Lane

• Lane 17 owns Phase 1 workflow viability hardening
• PR test(zigux): add lane17 applied bench workflow contract #14571 protects the intended bench self-test -> live bench packet check -> find-bit bench self-test -> find-bit bench packet order
• this follow-up makes that contract directly runnable through zig build and fixes the contract's negative case before the actual shared workflow insertion is attempted

Validation

• focused scratch validation used the attached Zig 0.17.0-dev.87+9b177a7d2 toolchain
• zig fmt --check zigux/tests/lane17_phase1_bench_live_workflow_applied_contract.zig zigux/tests/lane17_phase1_bench_live_workflow_applied_contract_build.zig
• cd zigux/tests && zig build --build-file lane17_phase1_bench_live_workflow_applied_contract_build.zig --list-steps
  • result: step list includes lane17-phase1-bench-live-workflow-applied-contract and test
• cd zigux/tests && zig build lane17-phase1-bench-live-workflow-applied-contract --build-file lane17_phase1_bench_live_workflow_applied_contract_build.zig --summary all
  • result: Build Summary: 3/3 steps succeeded; 4/4 tests passed
• authenticated compare against base branch after publication:
  • changed files: 2
  • contract diff: 1 added assertion line
  • build runner: 1 added file
  • result: ahead_by: 3
  • result: behind_by: 0
  • result: status: ahead

Scope

• lane: Lane 17 — Phase 1 workflow viability hardening
• session issue: Zigux session 2026-05-29 03:34 UTC — Lane 17 workflow viability hardening #14625
• base PR: test(zigux): add lane17 applied bench workflow contract #14571
• base branch: zigux-builder/lane17-bench-live-applied-contract-20260529t0237z
• branch: zigux-builder/lane17-bench-live-contract-runner-fix-20260529t0342z
• files:
  • zigux/tests/lane17_phase1_bench_live_workflow_applied_contract.zig
  • zigux/tests/lane17_phase1_bench_live_workflow_applied_contract_build.zig

Coordination

• keep PR test(zigux): add lane17 applied bench workflow contract #14571 as the underlying applied-state contract
• keep PR test(zigux): add lane17 bench live step patch contract #14513 as the patch-shape contract frontier
• keep PR test(zigux): add lane17 phase1 bench workflow handoff guard #14452 as the handoff contract frontier
• 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-contract-runner-fix-20260529t0342z

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