Add PhiSpiral256 Leaf Planetarium integration plan #487

Job	Run time
hpc-stream-parallel/rayon	1m 20s
nostd/thumbv6m-none-eabi/stable	27s
Pass MSRV values to other jobs	2s
format/stable	21s
tier4-avx512-check	33s
nightly-simd-polyfill	36s
cargo-careful	44s
miri	1m 11s
clippy/1.95.0	43s
native-backend/stable	7m 45s
docs/nightly	51s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
blas-msrv	51s
tests/stable	10m 53s
tests/1.95.0	10m 31s
tests/beta	10m 43s
conclusion	0s
	47m 31s

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