Four results docs under docs/workshops/body-map-viewer/measurements/ and the
brief's measurement appendix rewritten from owners/effort to MEASURED
headlines: settled hydrology viable (~24 ms/body, 273 bodies ~0.8 s);
parallel derive throughput holds 330K-8.3M cells (~64 ms / ~1.8 s); block+tile
cost-cleared (deepest step 83K cells ~17 ms); PNG-per-field smallest and
fastest with the tagged-envelope migration foreclosed by byte math (21x the
ceiling at the smallest size); texture upload a non-issue (8.3M px ~3.2 ms,
L8 4-9x cheaper). All numbers post-date the background-load closure with
stability re-runs. The workshop round-1 gate is satisfied.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>