ci: use shared doc workflows

[Beforerr]

• DocCleanup.yml → stub calling JuliaSpacePhysics/actions doc-cleanup.yml
• Depends on Add reusable doc-cleanup workflow; drop broken DocsNav copy actions#5

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	main	beec44b...	main / beec44b...
elx/full_load	24 ± 1.6 μs	24.3 ± 1.2 μs	0.986 ± 0.084
elx/sum_array	1.21 ± 0.48 μs	1.06 ± 0.59 μs	1.14 ± 0.78
elx/sum_lazy	1.21 ± 0.31 μs	1.22 ± 0.29 μs	0.992 ± 0.35
elx/sum_var_access	0.912 ± 0.45 μs	0.941 ± 0.68 μs	0.969 ± 0.85
elx/var_access	0.12 ± 0.01 μs	0.12 ± 0.01 μs	1 ± 0.12
mms/full_load	14.4 ± 1.4 μs	15.2 ± 1.4 μs	0.948 ± 0.13
mms/sum_array	0.0609 ± 0.0015 s	0.062 ± 0.0024 s	0.982 ± 0.045
mms/sum_slice	2.28 ± 0.072 ms	2.25 ± 0.11 ms	1.01 ± 0.057
mms/sum_var_access	2.22 ± 0.14 ms	2.32 ± 0.1 ms	0.957 ± 0.072
mms/var_access	0.05 ± 0.01 μs	0.05 ± 0.01 μs	1 ± 0.28
time_to_load	0.104 ± 0.0053 s	0.107 ± 0.0047 s	0.975 ± 0.065

Memory benchmarks

	main	beec44b...	main / beec44b...
elx/full_load	0.217 k allocs: 24.8 kB	0.217 k allocs: 24.8 kB	1
elx/sum_array	12 allocs: 28 kB	12 allocs: 28 kB	1
elx/sum_lazy	12 allocs: 28 kB	12 allocs: 28 kB	1
elx/sum_var_access	14 allocs: 28.3 kB	14 allocs: 28.3 kB	1
elx/var_access	1 allocs: 0.234 kB	1 allocs: 0.234 kB	1
mms/full_load	0.065 k allocs: 6.45 kB	0.065 k allocs: 6.45 kB	1
mms/sum_array	1.04 k allocs: 31.7 MB	1.04 k allocs: 31.7 MB	1
mms/sum_slice	0.069 k allocs: 1.29 MB	0.069 k allocs: 1.29 MB	1
mms/sum_var_access	0.069 k allocs: 1.29 MB	0.069 k allocs: 1.29 MB	1
mms/var_access	1 allocs: 0.219 kB	1 allocs: 0.219 kB	1
time_to_load	0.2 k allocs: 11.8 kB	0.2 k allocs: 11.8 kB	1