Approach 3 (record floor field): build905.zig declares cpu_floor="baseline"
beside the default_target pin and writes cpu_floor + cpu_model into each
family member's embedded record [provenance] (= target.result.cpu.model.name,
so "x86_64" for the default build, "znver5" for -Dcpu=native - the floor is a
default, not a restriction). family_artifacts.tcl derives both from the
embedded record (G-117 single-source-of-truth) into the sidecar [provenance],
failing if absent; family_check.tcl asserts them non-empty.
Approach 4 (audit tool): scriptlib/developer/cpufloor_audit.tcl disassembles a
binary's .text via a located objdump (llvm-objdump preferred, GNU fallback) or
audits a pre-disassembled excerpt, classifies by AVX register width (zmm=v4,
ymm=v3; baseline/v2 forbid both, v3 forbids zmm, v4 allows all), reports
out-of-floor count + first RVA + sample mnemonics, exit 0 PASS / 1 FAIL.
Bundled fixtures in cpufloor_fixtures/ are real disassembly excerpts (avx512,
avx2, clean); selftest 12/12 cases pass. Verified on real binaries: rebuilt
bin/punkzip.exe PASS (zmm=0); a -Dcpu=native probe FAILs at baseline (123 zmm)
and PASSes at v4.
Approach 5 (punk-runtime surfacing): both .ps1 and .bash twins updated and
re-wrapped. Host CPU level detection (PS via IsProcessorFeaturePresent PF
SSE2=10/SSE4.2=38/AVX2=40/AVX512F=41; bash via /proc/cpuinfo flags) feeds a
meets/below/unknown/norecord verdict. fetch prints cpu floor (UNGATED - a
cross-platform fetch for another machine stays free); list annotates rows the
host cannot run (!CPU-FLOOR:v<req>, local rows only); use/run gate on below
with a named diagnosis instead of a silent STATUS_ILLEGAL_INSTRUCTION
(0xC000001D) - the 2026-08-06 AVX-512 regression failure mode; info adds the
fields. bin/punk-runtime.cmd re-wrapped (deterministic;
scriptwrap_runtime_cmd_roundtrip_no_drift test PASSES).
Activation: overlap survey re-run at activation (goals_xref score G-172) - no
goals drafted in the interval; existing Related: notes cover every pair.
Project version 0.57.0 -> 0.57.1 (patch - user-visible punk-runtime behaviour
shipped in kits). Remaining for acceptance: rebuild + republish in-situ (per
Approach 6's alpha dispensation) and audit the republished artifacts to confirm
zmm=0 - a publication-time, user-owned step.
Assisted-by: harness=pi; primary-model=huggingface/zai-org/GLM-5.2; api-location=huggingface.co
Julian Noble
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