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settled-reach/server/tests
jpmschweitzerandClaude Opus 5 6cfd829445 feat(simulation): sub-cell composition — a summarised cell can contain its minority (T-1213)
D-258 invariant 2: descending the ladder must reveal COMPOSITION, so a cell
reading "forest" globally contains the clearings, marsh, rock and scrub the
vote suppressed. Below Global it contained nothing: morphology carried NINE
zones at Global and exactly ONE (AlluvialPlain) at every rung under it, and
vegetation collapsed to one class from District down.

WHY THE EXISTING TIERS COULD NOT DO IT. vegetation_invention already perturbs
moisture with a massif band and a texture band — but that pair was built for
cross-rung coherence and is weighted 70/30 specifically so "the texture term
alone can never outweigh the massif term". It is designed NOT to change a
verdict, which is the exact opposite of what composition needs.

And it could not simply be turned up. Measured: 50.2% of the texture field's
amplitude sits in its 32,768 m octave alone, and everything at or below 2,048 m
holds 5.9% of the total. Across a District window only that 5.9% varies, which
after the 30% weight and a ~29-point ceiling swings moisture by +/-0.51 points
against vegetation gates 5-15 points apart. Nothing could ever cross one. That
is the geometric series, not a tuning shortfall — raising the ceiling enough to
matter at District would make the field violent at Region.

So a third tier carries the fine band ALONE, normalized to its own full swing:
quiet where the coarse tiers are loud, loud where they have nothing left to
say. It feeds BOTH classification inputs, because moisture alone would have
left morphology just as flat.

CONSERVATION IS THE BOUND, not weighting (D-258 invariant 3). The field is
zero-mean, so a downsample returns the summary it was added to. Pinned two
ways: a field-level zero-mean test, and a real-terrain test that derives a
District-sized patch and asserts the majority vegetation class survives.

RARE INCLUSIONS, and this was a correction. The smooth term is a gentle sway
around the base, so it can only flip a verdict where the ground already sits
near a gate — which made deep-in-class ground immune, and the conservation test
duly measured a patch that was 100% Forest. A monoculture is the flat map this
ticket exists to fix, one scale down. Jeroen: "maybe a dense forest should
still sometimes produce a clearing or a rocky outcropping." D-258 says CONTAIN,
not border on. A sparse high-contrast term now rides on top — thresholded value
noise so inclusions are connected blobs rather than stray speckled cells. The
same patch now reads 98.9% Forest with 1.1% Barren outcrops.

The moisture half of an inclusion obeys the envelope rule (a world with no
patchiness ceiling grows no glades — caught by the zero-ceiling test, which the
first version failed by putting damp pockets on airless rock); the slope half
does not, because an outcrop is geology and a dead world is exactly where bare
rock should break the surface.

The slope ceiling is 6, not the 15 first written. Measured against the
window-derivation fixtures, base slope_q on ordinary ground is 2-6, so +/-15
did not vary the signal but REPLACED it — one fixture moved 6 -> 19 and two
coastal samples flipped to Wetland on invented slope alone. The morphology
gates are far apart because a cliff coast is a real landform; composition must
let marginal ground fall both ways, never manufacture a fjord on a flood plain.

NOT applied at the orbital rung, which is envelope-only by design and documents
that it never invents slope — pinned by
derive_orbital_at_metres_never_invents_slope, which caught the first version.

Both goldens move in the IMPROVING direction, checked before updating rather
than blind-refreshed:
  GJ338Bd  moisture 75->85 distinct, slope 28->34 (range 0-50), materials 3->4
  GJ244Ad  moisture 25->42, slope 15->22, morphology zones 6->7, materials 2->3

Ladder effect (was -> now): Region moisture 25->39; District moisture 3->17 and
vegetation 1->2; Quarter moisture 3->8.

45 server suites green, clippy clean.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-08-08 10:01:16 +02:00
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