ci(bootstrap): prune four macOS-only failures from the ratchet baseline

[gHashTag]

Closes #2387

What

Four tests are in scripts/ci/test-baseline.txt as failing, and the Linux runner passes
them. From the first test-ratchet run on master (e109851b):

73 targets ran; 379 failing test(s) (baseline 383)
4 baselined test(s) now PASS — prune them from the baseline:
  - spec_first_layer2_packs_two_neuron_trits            (tests/bitnet_layer.rs)
  - spec_first_mlp2_two_layer_inference_matches_reference (tests/bitnet_mlp.rs)
  - spec_first_mlp3_three_layer_inference_matches_reference (tests/bitnet_mlp3.rs)
  - spec_first_neuron_n_accumulates_and_quantizes       (tests/bitnet_neuron_nchunk.rs)

They fail on macOS/arm64, where the baseline was generated, and pass on ubuntu-latest.

Why it matters

A CI-passing test left in the baseline is invisible if it breaks. The ratchet fails only
on names that are new relative to the baseline, so these four could start failing on Linux
tomorrow and the gate would stay green — the exact blind spot the ratchet exists to remove,
reintroduced in its own input.

The general rule this fixes: the baseline must describe the platform that gates. A
baseline taken somewhere else describes a different suite.

What this does not establish

• Why they differ across platforms was not investigated. Endianness, float formatting,
  path separators and filesystem ordering are all plausible and none is confirmed. The four
  are spec_first_* inference-vs-reference comparisons, which suggests a numeric or ordering
  difference rather than a build problem, but that is a guess and is labelled as one.
• Pruning them means a macOS developer running the suite locally will now see four
  failures the ratchet does not know about. That is the correct trade — CI is what gates —
  but it is a trade, not a free win, and it is worth a note in the file, which this adds.
• It does not fix the four. If they should pass on macOS too, that is separate work.

Related: #2382, #2383, #2386.

[github-actions]

PR Dashboard

Generated at: 2026-08-22 08:24:44 UTC

• ci(bootstrap): prune four macOS-only failures from the ratchet baseline #2388 ci(bootstrap): prune four macOS-only failures from the ratchet baseline | Created: 2026-08-22 | Updated: 2026-08-22 | 19 failing / 24 total
• corpus: freeze the damage, patch one class at a time, and say where one rule stops #2161 corpus: freeze the damage, patch one class at a time, and say where one rule stops | Created: 2026-08-14 | Updated: 2026-08-21 | 0 failing / 9 total
• Unbreak FPGA CI and correct two unbacked hardware claims #2081 Unbreak FPGA CI and correct two unbacked hardware claims | Created: 2026-08-11 | Updated: 2026-08-20 | 5 failing / 27 total

Summary

Status	Count
Total Open PRs	3
PRs with Failing Checks	2
PRs with All Checks Green	1
READY	1
FAILING	2
PENDING	0

Seal Status

• ⚠️ STALE -- sha256(compiler.rs)=fba627661c36 != manifest seal=87e5cbd3ad94.
  The committed NMSE numbers were certified against an older compiler.rs.
  Run scripts/reseal-check.sh locally for the two-step reseal command (advisory; not a merge gate).

[github-actions]

📓 NotebookLM Notebook linked to this PR

• Notebook ID: b83263109fb055dc
• URL: https://notebooklm.google.com/notebook/b83263109fb055dc

This notebook contains session context, decisions, and artifacts for this work.