docs(.claude/ATT): add §16 Model Stylesheet + Mid-Task Switching #323

Job	Run time
hpc-stream-parallel/rayon	1m 19s
nostd/thumbv6m-none-eabi/stable	28s
native-backend/stable	8m 15s
docs/nightly	48s
Pass MSRV values to other jobs	4s
format/stable	22s
miri	39m 56s
clippy/1.95.0	43s
cargo-careful	41s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
blas-msrv	53s
tests/stable	10m 29s
tests/beta	11m 0s
tests/1.95.0	10m 43s
conclusion	0s
	1h 25m 41s

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