feat: rasterize Cornerstone + honest UI skip reasons + register gate

Upload data/registers/mta_entrances.json with huggingface_hub

Backend evolution: Phases 1-10 specialists + agentic FSM + Mellea + LiteLLM router

Bulk register + compare modes

Microtopo specialist: 3DEP elevation + TWI + HAND

Prithvi-EO 2.0 baked Ida 2021 satellite segmentation

USGS STN Hurricane Ida 2021 high-water marks

DEP stormwater specialist + 3 forward-modelled rainfall scenarios

Sandy 2012 inundation specialist + .gitattributes LFS for *.geojson