consolidate: add project-agnostic multi-agent kit (.claude/EN/) #296

Job	Run time
nostd/thumbv6m-none-eabi/stable	25s
hpc-stream-parallel/rayon	1m 21s
clippy/1.95.0	41s
native-backend/stable	8m 18s
Pass MSRV values to other jobs	3s
format/stable	20s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	-1s
cargo-careful	-1s
docs/nightly	-1s
miri	-1s
blas-msrv	46s
tests/stable	10m 51s
tests/beta	10m 29s
tests/1.95.0	10m 42s
conclusion	0s
	43m 52s

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