test(zigux): add lane16 rbtree findAddCached replay runner

[adybag14-cyber]

Summary

• add zigux/tests/phase1_rbtree_find_add_cached_bench_replay_build.zig as a focused standalone Lane 16 build shard for the existing cached rbtree findAddCached(...) bench replay on PR test(zigux): add lane16 rbtree findAddCached bench replay #13074
• expose both a named phase1-rbtree-find-add-cached-bench-replay step and a plain test alias
• keep the change one-file scoped and stacked, with no edits to the replay body, shared Phase 1 bench files, checker scripts, helper bodies, docs, fixtures, or workflows

Why This Lane

• Lane 16 owns the Phase 1 hardening gates around bench-sensitive helper packets
• PR test(zigux): add lane16 rbtree findAddCached bench replay #13074 already carries the standalone phase1_rbtree_find_add_cached_bench_replay.zig witness, but that replay did not yet have the newer direct zig build route pattern
• this runner hardens the gate by making the cached replay directly runnable without widening zigux/tests/phase1_bench_build.zig or tools/lib/rbtree.zig

Validation

• authenticated base-branch reread confirmed zigux/tests/phase1_rbtree_find_add_cached_bench_replay.zig exists on branch zigux-builder/lane16-find-add-cached-bench-replay-current-master-20260528t0136z
• authenticated base-branch reread confirmed zigux/tests/phase1_rbtree_find_add_cached_bench_replay_build.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 remains blocked in this scheduled runtime
• zig fmt --check zigux/tests/phase1_rbtree_find_add_cached_bench_replay.zig zigux/tests/phase1_rbtree_find_add_cached_bench_replay_build.zig tools/lib/rbtree.zig
• cd zigux/tests && zig build --build-file phase1_rbtree_find_add_cached_bench_replay_build.zig --list-steps
  • result: step list includes phase1-rbtree-find-add-cached-bench-replay and test
• cd zigux/tests && zig build phase1-rbtree-find-add-cached-bench-replay --build-file phase1_rbtree_find_add_cached_bench_replay_build.zig --summary all
  • result: Build Summary: 3/3 steps succeeded; 2/2 tests passed
  • result: phase1-rbtree-find-add-cached-bench-replay success
• cd zigux/tests && zig build test --build-file phase1_rbtree_find_add_cached_bench_replay_build.zig --summary all
  • result: Build Summary: 3/3 steps succeeded; 2/2 tests passed
• authenticated compare after publication against PR test(zigux): add lane16 rbtree findAddCached bench replay #13074 branch:
  • 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 08:30 UTC #14921
• base PR: test(zigux): add lane16 rbtree findAddCached bench replay #13074
• branch: zigux-builder/lane16-find-add-cached-replay-runner-20260529t0835z
• file:
  • zigux/tests/phase1_rbtree_find_add_cached_bench_replay_build.zig

Coordination

• keep PR test(zigux): add lane16 rbtree findAddCached bench replay #13074 as the replay-body base for this stacked runner
• keep PR test(zigux): add lane16 rbtree findAdd replay runner #14806 as the separate non-cached findAdd(...) replay runner frontier
• keep PR test(zigux): add lane16 rbtree postorder replay runner #14749 as the separate rbtree postorder replay runner frontier
• keep PR test(zigux): add lane16 bitmap-window bench replay runner #14688 as the separate bitmap-window replay runner frontier
• keep PR test(zigux): add lane16 rbtree cached bench replay runner #14628 as the separate rbtree cached-root replay+runner frontier
• keep PR test(zigux): add lane16 rbtree duplicate mutation replay runner #14569 as the separate rbtree duplicate-mutation 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 PR test(zigux): add lane16 rbtree bench replay runner #14329 as the separate plain rbtree replay runner frontier
• keep 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 snapshot-backed local 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-find-add-cached-replay-runner-20260529t0835z

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