chore: add LFS tracking rules for screenshots and slide PNGs

deploy: sync all changes from main at 6904684

Bulk register + compare modes

Granite Embedding 278M RAG over five NYC resilience plans

Microtopo specialist: 3DEP elevation + TWI + HAND

DEP stormwater specialist + 3 forward-modelled rainfall scenarios

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

initial commit