docs(board): refresh blackboard to current epoch + append 2026-05-26 epiphanies #525

Job	Run time
tier4-avx512-check	32s
hpc-stream-parallel/rayon	1m 29s
native-backend/stable	7m 53s
Pass MSRV values to other jobs	4s
clippy/1.95.0	44s
nostd/thumbv6m-none-eabi/stable	29s
format/stable	24s
miri	0s
nightly-simd-polyfill	0s
docs/nightly	0s
cargo-careful	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
blas-msrv	57s
tests/1.95.0	10m 42s
tests/stable	10m 50s
tests/beta	12m 19s
conclusion	0s
	46m 23s

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