Resolves Q-110 (region/chunk physical-scale anchoring), which had three
contradictory metres-per-scale assumptions in the cascade and no record
fixing metres-per-heightmap-pixel.
D-243 establishes a nested absolute-metre containment ladder with a single
elastic seam at planetary scale:
voxel 1m -> chunk 64m -> block 128m -> quarter 512m -> district 2km
-> region ~205km (100x100 districts) -> (elastic) -> planet
A body holds round(2*pi*R/204.8km) regions (the only per-body-floating
quantity); everything below is fixed integer math, so ChunkPos->RegionPos
is body-independent. The region is the largest hard block: the climate/
weather/season lockdown scale (the Q-105 cheap-dynamism source) and the
sane planetary grid. Sub-heightmap detail is invented deterministically
(interpolation + domain warp + detail-scatter, never stored, D-227); climate
is edge-fuzzed so the grid never shows ('climate does not change on a line').
Vocabulary locked and recorded in CLAUDE.md: 'region' = the 205km metric
cell only; the old 1km RegionProfile is dropped onto the 2km district; D-201
tier-4 'Region' renamed Province (the watershed/political overlay), amended
here. Refines D-239 §2 (district temperature now modulates a region baseline).
Implementation tickets: T-1077 (re-scale the code to the ladder + elastic-seam
resampling; blocks T-1046) and T-1078 (region climate stack + edge fuzz).
T-1046 is un-gated on Q-110 and now blocked only by T-1077.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
e39ba89064