test(zigux): add lane16 rbtree cached bench replay runner

[adybag14-cyber]

Summary

• restack zigux/tests/phase1_rbtree_cached_bench_replay.zig onto fresh current master
• add zigux/tests/phase1_rbtree_cached_bench_replay_build.zig so the cached-root replay has a direct focused zig build route
• keep the change scoped to a two-file Zig tests-root packet without reopening shared bench logic, checker scripts, docs, workflows, or tools/lib/rbtree.zig

Why This Lane

• Lane 16 owns Phase 1 hardening gates around bench-sensitive helper packets
• the older same-file cached replay review path on PR test(zigux): restack lane16 rbtree cached bench replay on current master #12396 was diverged and did not include the newer direct build-shard pattern
• current master returned 404 for both target files before publication, so this fresh branch gives the cached rbtree bench replay a current-head-safe review path plus its standalone runner

Validation

• authenticated master...master compare before branch cut reported status: identical at base SHA d2bb0758d052b50430f6049befc6d9d7c2e0d7c2
• exact current-master rereads confirmed both target paths returned 404 Not Found before publication:
  • zigux/tests/phase1_rbtree_cached_bench_replay.zig
  • zigux/tests/phase1_rbtree_cached_bench_replay_build.zig
• 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_cached_bench_replay.zig zigux/tests/phase1_rbtree_cached_bench_replay_build.zig tools/lib/rbtree.zig
• cd zigux/tests && zig build --build-file phase1_rbtree_cached_bench_replay_build.zig --list-steps
  • result: step list includes phase1-rbtree-cached-bench-replay and test
• cd zigux/tests && zig build phase1-rbtree-cached-bench-replay --build-file phase1_rbtree_cached_bench_replay_build.zig --summary all
  • result: Build Summary: 3/3 steps succeeded; 2/2 tests passed
  • result: phase1-rbtree-cached-bench-replay success
• initial publication raced a moving master; the final branch was restacked onto b20ad6710d6b36d2336defdc600d1538d16dc905
• authenticated compare after restack:
  • changed files: 2
  • result: ahead_by: 2
  • result: behind_by: 0
  • result: status: ahead

Scope

• lane: Lane 16 — Phase 1 hardening gates
• session issue: #14624
• supersedes stale/diverged same-file replay path: #12396
• branch: zigux-builder/lane16-rbtree-cached-bench-replay-current-master-20260529t0336z
• base commit: b20ad6710d6b36d2336defdc600d1538d16dc905
• files:
  • zigux/tests/phase1_rbtree_cached_bench_replay.zig
  • zigux/tests/phase1_rbtree_cached_bench_replay_build.zig

Coordination

• 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): 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 due CONNECT tunnel failed, response 403, so live repo grounding and publication used authenticated GitHub reads/writes plus focused current-like 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-rbtree-cached-bench-replay-current-master-20260529t0336z

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[adybag14-cyber]

Session completion: 2026-05-29 03:38 UTC

Completed Lane 16 Phase 1 hardening-gate progress by publishing draft PR #14628.

Progress:

• added zigux/tests/phase1_rbtree_cached_bench_replay.zig
• added zigux/tests/phase1_rbtree_cached_bench_replay_build.zig
• superseded the stale/diverged cached replay path on PR test(zigux): restack lane16 rbtree cached bench replay on current master #12396 with a fresh current-master two-file packet

Validation:

• exact current-master absence checks for both target paths before publication
• authenticated current-master helper grounding for tools/lib/rbtree.zig
• focused scratch validation with attached Zig 0.17.0-dev.87+9b177a7d2
• zig fmt --check zigux/tests/phase1_rbtree_cached_bench_replay.zig zigux/tests/phase1_rbtree_cached_bench_replay_build.zig tools/lib/rbtree.zig
• zig build --build-file phase1_rbtree_cached_bench_replay_build.zig --list-steps
• zig build phase1-rbtree-cached-bench-replay --build-file phase1_rbtree_cached_bench_replay_build.zig --summary all passed with 3/3 steps and 2/2 tests

Publish:

• draft PR: test(zigux): add lane16 rbtree cached bench replay runner #14628
• branch: zigux-builder/lane16-rbtree-cached-bench-replay-current-master-20260529t0336z
• final compare: ahead_by: 2, behind_by: 0, status: ahead

Notes:

• direct live clone remained blocked by CONNECT tunnel failed, response 403, so validation used the established authenticated-read plus scratch-tree path
• initial branch creation raced a moving master; final branch was restacked onto b20ad6710d6b36d2336defdc600d1538d16dc905 before PR creation
• no new code blocker was opened; this uses the already-known no-checkout workaround pattern