feat: streaming GGUF → bgz17 indexer + OpenChat 679× compression #53

Job	Run time
clippy/stable	25s
format/stable	29s
Pass MSRV values to other jobs	2s
native-backend/stable	39s
cross_test/s390x-unknown-linux-gnu/stable	1m 31s
nostd/thumbv6m-none-eabi/stable	26s
cross_test/i686-unknown-linux-gnu/stable	1m 36s
cargo-careful	0s
miri	0s
docs/nightly	0s
tests/beta	1m 38s
blas-msrv	59s
tests/1.64.0	1m 23s
tests/stable	1m 30s
conclusion	0s
	10m 38s

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