test(scripts/zigux): add lane14 same-class trailing not-elf replay

[adybag14-cyber]

Summary

• add scripts/zigux/mk_elfconfig_fd_trailing_same_class_not_elf_hides_following_not_elf_test.zig as a fresh standalone Lane 14 fd replay on a new filename
• add scripts/zigux/check-mk-elfconfig-fd-trailing-same-class-not-elf-hides-following-not-elf-markers.py so the packet fails closed if its two same-class trailing not ELF tests drift or disappear
• keep the change additive and off the large mk_elfconfig.zig helper body while the lane still prefers fresh standalone fd packets in no-checkout runs

Why This Lane

• Lane 14 still owns the bounded Phase 2 mk_elfconfig helper tranche from the roadmap and bootstrap ledger
• the lane already had same-class trailing-hide siblings for ELF headers and invalid-class headers, but it still lacked the matching same-class not ELF sibling on a clean filename
• this keeps the work .zig-first, lands real same-lane progress, and avoids widening into docs, workflow, fixture, or helper-body write sets

Validation

• scratch replay used the active Lane 14 helper body plus the attached Zig toolchain 0.17.0-dev.87+9b177a7d2
• zig fmt --check /workspace/.scratch/lane14_same_class_not_elf/scripts/zigux/mk_elfconfig_fd_trailing_same_class_not_elf_hides_following_not_elf_test.zig
• cd /workspace/.scratch/lane14_same_class_not_elf/scripts/zigux && zig test mk_elfconfig_fd_trailing_same_class_not_elf_hides_following_not_elf_test.zig
  • result: All 33 tests passed.
• python3 -m py_compile /workspace/.scratch/lane14_same_class_not_elf/scripts/zigux/check-mk-elfconfig-fd-trailing-same-class-not-elf-hides-following-not-elf-markers.py
• cd /workspace/.scratch/lane14_same_class_not_elf && python3 scripts/zigux/check-mk-elfconfig-fd-trailing-same-class-not-elf-hides-following-not-elf-markers.py --self-test
  • result: MK_ELFCONFIG_FD_TRAILING_SAME_CLASS_NOT_ELF_HIDES_FOLLOWING_NOT_ELF_MARKERS_SELF_TEST=pass
  • result: MK_ELFCONFIG_FD_TRAILING_SAME_CLASS_NOT_ELF_HIDES_FOLLOWING_NOT_ELF_MARKERS_SELF_TEST_CASE_COUNT=4
• cd /workspace/.scratch/lane14_same_class_not_elf && python3 scripts/zigux/check-mk-elfconfig-fd-trailing-same-class-not-elf-hides-following-not-elf-markers.py
  • result: MK_ELFCONFIG_FD_TRAILING_SAME_CLASS_NOT_ELF_HIDES_FOLLOWING_NOT_ELF_MARKERS=pass
  • result: MK_ELFCONFIG_FD_TRAILING_SAME_CLASS_NOT_ELF_HIDES_FOLLOWING_NOT_ELF_MARKERS_COUNT=2

Scope

• lane: Lane 14 — Phase 2 mk_elfconfig lane
• session issue: #12116
• branch: zigux-builder/lane14-trailing-same-class-not-elf-hide-current-20260527t0001z
• files:
  • scripts/zigux/mk_elfconfig_fd_trailing_same_class_not_elf_hides_following_not_elf_test.zig
  • scripts/zigux/check-mk-elfconfig-fd-trailing-same-class-not-elf-hides-following-not-elf-markers.py
• intentionally no edits to scripts/zigux/mk_elfconfig.zig, shared fixtures, .github/workflows/zigux-bootstrap.yml, docs, or zigux/Makefile

Coordination

• base this review on draft PR #11364 because that branch already carries the same-class trailing ELF sibling this packet complements
• compare zigux-builder/lane14-trailing-same-class-hide-current-master-20260526t0235z...zigux-builder/lane14-trailing-same-class-not-elf-hide-current-20260527t0001z
  • result: changed files remain exactly the two new packet files
  • result: ahead_by: 3
  • result: behind_by: 0
  • result: status: ahead
• the next honest merge-path follow-through is to fold this packet into the broader Lane 14 current-master line after the sibling review surface is accepted, not to widen into a helper rewrite here

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