Adapted for latest `rand` APIs#474

Draft

finalyards wants to merge 32 commits intoembassy-rs:mainfrom

finalyards:pr-rand-catchup

Commits on Oct 28, 2025

mmmm
finalyards
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Commits on Oct 29, 2025

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Merge remote-tracking branch 'origin/main'
finalyards
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Commits on Nov 14, 2025

Merge remote-tracking branch 'origin/main'
finalyards
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Merge remote-tracking branch 'origin/main'
finalyards
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Pumps up p256, rand (though they are still rc; no longer pre!); changes to 'security' feature flag use.
finalyards
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Commits on Nov 23, 2025

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Merge remote-tracking branch 'origin/main' into pr-rand-catchup
finalyards
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Commits on Nov 25, 2025

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merge with upstream changes
finalyards
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Commits on Nov 30, 2025

Updated to work with nRF52 (again); placed 'nrf-sdc' to come from a submodule, allowing a shallow clone to be used (huge memory and download savings, in magnitude of 1gig)
finalyards
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Commits on Dec 4, 2025

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one more
finalyards
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Commits on Dec 29, 2025

Using 'chacha' mostly through 'rand', 'rand_core' likewise.
finalyards
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Commits on Dec 31, 2025

Lock updates; elliptic-curve 0.14.0-rc.17 -> rc.18
finalyards
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Commits on Jan 7, 2026

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Commits on Jan 9, 2026

passes. now
finalyards
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Commits on Jan 28, 2026