test(zigux): add lane16 rbtree duplicate mutation replay runner

[adybag14-cyber]

Summary

• add zigux/tests/phase1_rbtree_duplicate_mutation_bench_replay_build.zig as a focused standalone Lane 16 build shard for the existing duplicate-mutation replay on PR test(zigux): add lane16 rbtree duplicate mutation bench replay #12902
• expose both a named phase1-rbtree-duplicate-mutation-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, and tools/lib/rbtree.zig

Why This Lane

• Lane 16 owns the Phase 1 hardening gates around bench-sensitive packets
• PR test(zigux): add lane16 rbtree duplicate mutation bench replay #12902 already carries zigux/tests/phase1_rbtree_duplicate_mutation_bench_replay.zig, but the replay did not have its dedicated direct zig build route
• this stacked runner follows the newer Lane 16 shard pattern without widening into helper implementation or aggregate bench files

Validation

• authenticated base-branch reread confirmed zigux/tests/phase1_rbtree_duplicate_mutation_bench_replay.zig exists on branch zigux-builder/lane16-rbtree-duplicate-mutation-bench-replay-current-master-20260527t2237z
• authenticated base-branch reread confirmed zigux/tests/phase1_rbtree_duplicate_mutation_bench_replay_build.zig returned 404 Not Found before publication
• authenticated current-master reread grounded the helper against live tools/lib/rbtree.zig at blob SHA b8cc3d811028922be412f40cfddfd8da82ea6d8c
• 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_rbtree_duplicate_mutation_bench_replay.zig zigux/tests/phase1_rbtree_duplicate_mutation_bench_replay_build.zig tools/lib/rbtree.zig
• cd zigux/tests && zig build --build-file phase1_rbtree_duplicate_mutation_bench_replay_build.zig --list-steps
  • result: step list includes phase1-rbtree-duplicate-mutation-bench-replay and test
• cd zigux/tests && zig build phase1-rbtree-duplicate-mutation-bench-replay --build-file phase1_rbtree_duplicate_mutation_bench_replay_build.zig --summary all
  • result: Build Summary: 3/3 steps succeeded; 2/2 tests passed
  • result: phase1-rbtree-duplicate-mutation-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: #14566
• base PR: #12902
• base branch: zigux-builder/lane16-rbtree-duplicate-mutation-bench-replay-current-master-20260527t2237z
• branch: zigux-builder/lane16-rbtree-duplicate-mutation-bench-replay-build-followup-20260529t0235z
• file:
  • zigux/tests/phase1_rbtree_duplicate_mutation_bench_replay_build.zig

Coordination

• keep PR test(zigux): add lane16 rbtree duplicate mutation bench replay #12902 as the separate duplicate-mutation replay body frontier
• keep PR test(zigux): add lane16 rbtree bench replay runner #14329 as the separate plain rbtree 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 the checker and aggregate bench packet 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 current-like local validation.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch zigux-builder/lane16-rbtree-duplicate-mutation-bench-replay-build-followup-20260529t0235z

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