38.18 confirmed the 1ph default-flip was sound for its own era, but that
measurement predates three changes to the objective it was measured
against -- 39.4's namespace fix, 38.10/38.11's per-space crinkliness, and
38.12's missing-space cascade -- and collapse_insearch runs collapse_global
inside every eval, valued against exactly the factors those touched. A
default carried on a superseded measurement is an assumption, not a result.
Re-ran the 1ph protocol as published on the current codebase:
N OFF ON W/L/T diff t p
published 1ph 20 7.95 7.10 11/6/3 +0.85 2.38 0.028
current objective 20 7.85 7.15 10/7/3 +0.70 1.82 0.069
current objective 40 7.60 7.03 21/14/5 +0.57 2.01 0.045
current objective 60 7.58 7.02 29/19/12 +0.57 2.45 0.017
Verdict: the default STANDS. At N=60, mean diff +0.567 fails/seed, paired
t=2.454 (df=59), p=0.0171 exact, 95% CI [+0.105, +1.029] excluding zero;
Wilcoxon signed-rank cross-check agrees (p=0.0138), which matters because
fail counts are small integers and normality is not obvious.
Two caveats. The effect is about a third smaller than published (+0.57 vs
+0.85) -- partly regression from a lucky N=20 draw, partly plausible real
erosion, since several fails collapse_global used to clear have been
redefined out of existence or made harder.
More usefully: the published N=20 can no longer detect its own effect. At
exactly that sample size the current answer is p ~= 0.069, a null by the
conventional threshold. Had I stopped at N=20 the honest report would have
been "the 1ph verdict no longer reproduces" and the default would have
looked unjustified. It took N=60 to resolve. That is the 8sh/1ph/qi6/lj3
pattern this log warns about, now biting the flagship result itself: any
future re-validation of this default needs N >= 40.
20 annotated in place so a reader of the original claim sees the current
figure. Harness takes a seed range now (APPEND=1 to extend a sweep).
Closes homemaker-py-ioe.
Lint at parity (46); tests 384 passed, 0 failed.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MJ84Feep79Hhm3E4zZJmnB
d86 asked for the rigorous version of 35's spot-check -- check out the
codebase at the 1ph commit, backport the iio stale-leaf-share fix, re-run
the historical seed sets.
One constraint had to be worked around: this repository's history begins
2026-07-30, six days AFTER the 1ph commit (2026-07-24), so that checkout
does not exist here. Closest reachable stand-in is 391f510 (2026-07-30), a
genuine ancestor of the iio fix and therefore pre-iio, carrying that era's
examples/ and objective. Measured there, not at the true 1ph commit, and
that is a real limitation of the reproduction.
Protocol as published: programme-house, budget 3000, 4 workers, seeds 1-20,
ON vs OFF, both arms finished with --collapse. Run twice over one worktree,
as-is then with the 22-line iio hunk applied.
OFF ON W/L/T mean diff t(df=19)
published 1ph 7.95 7.10 11/6/3 +0.85 2.38
pre-iio 391f510 8.05 7.10 11/6/3 +0.95 2.59
same + iio fix 8.05 7.10 11/6/3 +0.95 2.59
The published verdict reproduces, and the iio fix changes nothing: 0 of 40
(seed, arm) cells differ, per-seed counts equal cell by cell.
It could not have been otherwise. The bug needs a leaf carrying a STALE
share/share_type, and leaf-sharing only stamps a share where a code has
count > 1 -- programme-house declares count: 1 for all six codes. Over 8
constructed seeds at that commit, programme-house had share_type set on 0
of 56 leaves; harbor-house on 24 of 128. _collapse_value reads
leaf.share_type, so the bug is structurally unreachable on the 1ph
protocol. That is why 35 saw 2/3 harbor seeds diverge by 5-8 fails while
programme-house at N=20 moves not one cell: harbor has codes at counts 10,
6 and 5.
20's retroactive caveat is discharged for the 1ph section and stays live
for harbor-house/qpk, where shares exist and divergence was measured.
Kept experiments/rerun_1ph_protocol.sh and both result TSVs.
Closes homemaker-py-d86.
Lint at parity (46); tests 384 passed, 0 failed.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MJ84Feep79Hhm3E4zZJmnB
