Owner: "maybe plot_ratio is having unintended consequences, Alexander simply
says that all levels should have accessible outside space, he doesn't say how
much."
Both halves are right, and the codebase had the two rules the wrong way round.
ratio_outside is a gaussian on the outdoor FRACTION, applied as a whole-building
multiplier, and its declared targets have no stated basis and contradict each
other: health-centre targets 0.06 and sits at 0.096-0.129, so it is penalised
x0.39-x0.77 for having too MUCH; programme-house targets 0.30 and sits at
0.098-0.293, penalised x0.40-x0.999 for having too LITTLE. Penalties as large as
the ratio_circulation ones 39.24 removed, pulling two programmes in opposite
directions on the same quantity.
force_roof_garden already implements the rule Alexander actually states -- per
level, no outdoor space at all is a hard fail, no quantity attached. It has
existed all along and was switched OFF in every corpus config.
Near-miss worth recording: measuring first, I found zero "no outside space"
fails across the twelve baseline runs and briefly read that as the requirement
being met everywhere. It meant the check never ran. Same shape as 39.20's parity
tests -- no failures from a test that is not executing looks exactly like no
failures from a test that passes, and the tell was again the config, not the
code.
Enabled, it bites on 4 of 25 baseline levels: maple s0 level 1, and
programme-house level 0 in all three seeds. A house with no outdoor space on its
own ground floor is a fair criticism of the layout, and exactly what a
building-level fraction cannot catch, since 22% outdoor concentrated on one
storey satisfies it perfectly.
The upper side ratio_outside used to provide is covered in a better currency by
the minimum-internal-area factor (internal area >= 1.2x the programme's declared
room area), which is live -- binding on harbor s0 x0.920 and programme-house s0
x0.787.
This is the one change in 39.22-39.25 whose risk is NOT measured: nothing here
proves the outdoor fraction will not drift up once the search is free to raise
it, and outdoor space is profitable (1.64 return against a room's 0.66). The
re-baseline (bk9) is what shows it, and 39.25 asks for the fraction to be
recorded there.
4 hard fails added, none removed. 426 passed.
Refs homemaker-py-hxi.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MJ84Feep79Hhm3E4zZJmnB
4931070602