feat(cesium): osm_pbf D-OSM-1 stub mirroring arcgis_pbf shape (5 unit + 7 doctests; live Q3 Y-flip helper) #538

Job	Run time
clippy/1.95.0	40s
format/stable	23s
nostd/thumbv6m-none-eabi/stable	34s
native-backend/stable	8m 2s
Pass MSRV values to other jobs	2s
tier4-avx512-check	41s
hpc-stream-parallel/rayon	1m 21s
docs/nightly	0s
cargo-careful	0s
miri	0s
nightly-simd-polyfill	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
tests/1.95.0	11m 33s
tests/beta	11m 29s
blas-msrv	45s
tests/stable	11m 29s
conclusion	0s
	46m 59s

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